Tag Archives: teaching

Standing waves.

A seesaw to visualize how standing waves move in an enclosed basin.

In enclosed basins, standing waves can occur. In the simplest case, they have a node in the middle and the largest amplitudes at the edges of the basin. The movement of the water’s surface then closely resembles that of a seesaw.

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A seesaw. Largest amplitudes at the ends, node in the middle.

Extremely simple but extremely effective visualization!

Progressive waves on a rope

Visualization of progressive waves: wave form and energy move forward while the rope itself stays in place.

When I talked about waves in GEOF130 recently, in order to explain the concept of progressive waves, I showed a drawing from one of the textbooks, where someone was moving a rope such that waves traveled on the rope. The idea was to show that for progressive waves the wave form and energy travel, while the matter itself stays more or less in place, only moving up and down or in circular orbital motions.

The look I got from one of the students for showing that drawing confused me a bit and I am still not sure whether it was a “I have no idea what you are trying to tell me!” or a “Duh! Are we in kindergarden?”, but I think it was probably closer to the former. So from now on I will carry a piece of rope on me to show this in lectures and to have students try themselves.

A wave shape traveling forward on a rope, while the rope itself stays in place.

I filmed a quick video because it was difficult to watch the wave while exciting it myself, but it turns out it is even more difficult to hold a camera more or less steady while exciting waves at the same time, plus the movement is pretty quick even for a camera as awesome as mine. Anyway, if you want to procrastinate learn more about waves, watch this!

Long-distance teaching.

My experiences with giving a lecture via Skype.

As I mentioned in yesterday’s post, I taught two lectures at the University Centre of the Westfjords, Iceland, in 2012 while physically being in Norway. How did that work out?

Teaching via Skype is a great option for when travel is not in the cards, be it for environmental, economic or other reasons. But I can tell you – it is a lot more stressful than teaching in person because you miss out on all of the non-verbal clues that tell you whether or not students are following. But I would do it again any time!

Why did it work out well? I think there were several important factors. In no particular order:

1) I over-prepared. I tend to be over-prepared, but in this case I put a lot of time into preparations, and I even talked through both lectures with a friend to make sure they were structured in a way that was easy to understand.

2) I had all the important key words on the slides. I always try to make sure to have key words on my slides so students can write down any weird technical terms that I might use and forget to explain, but in this case I defined everything on the slides.

3) I had an ally physically present in the class room. I think this was probably the most important reason for why things worked out really well and why my stress levels didn’t go through the roof when we realized that the internet connection was too weak for a two-way video. When departing for a research cruise from Reykjavik and visiting someone at their marine research institute, I happened to walk into the lab of the person who was responsible for the course, Hrönn. Hrönn and I clicked immediately and so while I was on Skype talking to the class, I knew I could rely on her to make sure things went well on the other end and to give me all the crucial information that would otherwise not have been communicated – if students got bored, if students looked like they did not understand, if everybody had left the room and left me sitting there, talking, if the connection was so bad people couldn’t understand me, etc.. Even though in the end she did not have to do anything, it helped enormously to know that she was there and would let me know if things went wrong.

4) I introduced myself to the students. I put up a picture of myself, talked about my background, where I was living, why I was interested in oceanography, why I was skyping in to give the lecture. During the lecture, I mentioned examples of how the topic was relevant to my personal life and told stories of my own experiences. Teaching via Skype adds a lot of distance – I tried to still be visible as a person and connecting on a personal level as much as possible.

5) I sent the slides before the call. This might seem obvious, but it really helped to know that they had the slides in Isafjördur already and that in the worst case if the internet were to break down, I could just deliver my lecture via speakerphone.

6) The slides were numbered with clearly visible numbers in one corner. Again, it might seem obvious, but it was really helpful to be able to say “go to slide 16” rather than having to go through “go three slides back, see the diagram? No? Then try going back one more. Still no diagram? I’m talking about the slide with ….”.

7) I made sure I could see the students. Since the internet connection was very slow, we could unfortunately not have a two-way video call for the whole duration of the lecture. But what we did was this: They showed my slides via a projector (thankfully they were numbered!), my video stream was initially, until the connection became too slow, shown on a laptop that was moved to face the class, and I could see the class via that laptop’s webcam. I could only see shapes and not distinguish facial expressions, but when I asked them to nod or shake their head in response to a question, I could see them respond. Next time, I would maybe even try using the ABCD card method or some other way to get more direct feedback in a Skype lecture.

8) We had tested the technology before. We knew what part of the classroom was visible via the webcam so we could ask the students to sit there, we had tested connecting via Skype, we had the telephone numbers on hand as a backup and we “met up” in Skype a couple of minutes before the lecture was supposed to start. But maybe this should go under the “over-prepared” heading.

All in all – I can’t stress the importance of preparation enough, and if you are to teach via Skype: Make sure you have someone in that class that you know and trust to be your ear on the ground to let you know if things don’t go the way they are supposed to.

And have fun! In the evaluation of that course, people explicitly mentioned my lectures as a highlight of the course, and I got really positive feedback. So teaching via Skype might be a bit of a hassle, but it is definitely possible to teach well via Skype.

Teaching in Isafjördur

Teaching a block course at the University Centre of the Westfjords, Iceland.

For those of you who were surprised that lately they didn’t recognize my students any more and the view from my office window was greatly improved: I am excited to be in Isafjördur in the Westfjords to teach the first two weeks of CMM31 “understanding the ocean” as part of the Master’s in Coastal and Marine Management.

Welcome to Isafjördur!

I visited the University Centre of the Westfjords by chance, really, when two years ago a research cruise ended in Isafjördur and I got in touch to ask whether they wanted to bring their students on a tour of the research ship. From that a connection developed and I taught two lectures on waves and tides at the University Centre of the Westfjords last year – except that I was sitting in my comfy office in Norway then and taught via Skype [more on how that worked in a later post]. While that was certainly an experience, this time I am actually physically present, and I’m very glad about that.

Isafjördur.

When preparing for the course I got an email from Dagny, the program’s academic director, who wrote “You will find that this is not a typical uni environment, hopefully in a good way.” And she was so right! It is not a typical university environment, but in the best way. I am so excited to be here and definitely hope to come back again next year! :-)

P.S.: The tag CMM31 marks posts that are about things I’ve been teaching while in Isafjördur.

Dangers of blogging, or ice cubes melting in fresh water and salt water

When students have read blog posts of mine before doing experiments in class, it takes away a lot of the exploration.

Since I was planning to blog about the CMM31 course, I had told students that I often blogged about my teaching and asked for their consent to share their images and details from our course. So when I was recently trying to do my usual melting of ice cubes in fresh water and salt water experiment (that I dedicated a whole series on, details below this post), the unavoidable happened. I asked students what they thought – which one would melt faster, the ice cube in fresh water or in salt water. And not one, but two out of four student groups said that the ice cube in fresh water would melt faster.

Student groups conducting the experiment.

Since I couldn’t really ignore their answers, I asked what made them think that. And one of the students came out with the complete explanation, while another one said “because I read your blog”! Luckily the first student with the complete answer talked so quickly that none of the other – unprepared – students had a chance to understand what was going on, so we could run the experiment without her having given everything away. But I guess what I should learn from this is that I have taken enough pictures of students doing this particular experiment so that I can stop alerting them to the fact that they can oftentimes prepare for my lectures by reading up on what my favorite experiments are. But on the upside – how awesome is it that some of the students are motivated enough to dig through all my blog posts and to even read them carefully?

For posts on this experiment have a look a post 1 and 2 showing different variation of the experiment, post 3 discussing different didactical approaches and post 4 giving different contexts to use the experiment in.

Why melting sea ice does not contribute to sea level rise.

Simple experiment on why the impact of glaciers and sea ice on sea level, respectively, are not the same.

It could be so simple: An ice cube sinks into water until the mass it replaces is equal to its own mass.

The mug is as full with water as it gets. But even if I stared out of the window at the mountain and the snow until this swimming piece of ice had completely melted – the water level in the mug would not have changed.

Since the mass of said ice cube is not changing when it melts, under the assumption that the difference in volume due to the temperature difference of the melt water and the water in which the ice cube swims is negligible (reasonable assumption in most cases) that means that a swimming ice cube can’t change the water level in a cup and a swimming ice berg can’t change sea level. Things are different for glaciers or other ice that is sitting on land rather than freely swimming.

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I should have thought about how I would transport the plate on which the mug with the ice is sitting back to the kitchen once the ice has melted. In other words: Yes, the mug will spill over.

This is a very easy demonstration and while it is intuitive that in the second case a mug that was completely filled with water when the ice was first added will spill over once the ice melts, the first case seems to be very difficult. Most students are not quite sure what they are expecting to see, and even if they are, they don’t really know why.

My typical drawing to explain this topic. The potato is supposed to be an ice berg floating in water.

I have always been teaching this by drawing the water level and the ice berg on the board, and then by marking the volume of the whole ice berg and the part of it that is under water, and trying to stress how the mass of the ice berg is the same as that of the water replaced by the part of the ice berg that is under water (because the molecules are more densely packed in liquid water and yada yada) — there must surely be a better way to explain this? Any ideas out there?

Experiments the Isafjördur way. Can you spot the two mugs and the ice in the middle of the window sill? Floating ice on the left, a “glacier” resting on forks above the water level on the right.

Measuring temperature.

Students build thermometers.

As described in this post, I like to have students build “instruments” to measure the most oceanographic properties (temperature, salinity and density). I find that they appreciate oceanographic data much more once they have first-hand experience with how difficult it is to design instruments and make sense of the readings. Over the last two days I described the experiments for salinity and density, today it’s temperature.

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Students building thermometers.

Measuring temperature is probably the most difficult of the three properties. Firstly, there are lots of technical difficulties to be overcome. How can we seal the mouth of the bottle around the straw in a way that it is really water tight? How much water do we have to fill in the bottle? Does it matter if there are air bubbles trapped? What if the water level when we fill the bottle is not visible because of the seal? If the straw is clogged up with modeling clay, will we still be able to use it in the instrument? How long does the straw have to be above the seal in order to avoid water spilling out when the temperatures we try to measure become too hot?

Then, there are many problems connected to the actual measurement. If we lift up the thermometer (and hence squeeze the plastic bottle) – how does that influence our reading? Since we have half a liter of water in the thermometer, are we actually measuring the temperature of the water sample, or are we influencing it while trying to measure? How do we come up with a scale for our temperature measurements had I not supplied (mercury-free) thermometers to calibrate the new thermometer with? So many questions to think about and discuss!

Measuring salinity

Students evaporate water to measure the salinity of a water sample.

As described in this post, I like to have students build “instruments” to measure the most oceanographic properties (temperature, salinity and density). I find that they appreciate oceanographic data much more once they have first-hand experience with how difficult it is to design instruments and make sense of the readings. Today I’m presenting two groups that focused on salinity, while yesterday’s group was measuring density.

Students evaporate water to measure the salinity of a water sample.

The students in the course I currently teach were determined to not only evaporate some water to qualitatively look at how much salt was dissolved in the sample, they wanted to do it right. So they set out to measure the vessel, the sample and the remaining salt. But since measuring salinity is really pretty difficult, they ran into a couple of problems. First – my scales were nowhere near good enough to measure the amount of water they could fit into the evaporation cup with any kind of precision. Second, even the amount of water that they could fit took a lot longer to evaporate (or even boil) than anticipated. Third, they realized that even though they could see salt residue in the end, this might not be all the salt that had been there in the beginning, plus there was grime accumulating at the base of the cup, so weighing the cup in the end might not be the best option. But they still learned a lot from that experiment: For example that once the (small quantity of) water was boiling, it became milky very quickly and then turned to crystallized salt almost instantly. Or that in order to use this method, a tea candle is not as suitable as a heat source as a lighter (and there might probably even be even better ones out there).

P.S.: In this course, none of the groups set the wooden tongs on fire! :-)

Measuring density

Students build a device to measure density.

As described in this post, I like to have students build “instruments” to measure the most oceanographic properties (temperature, salinity and density). I find that they appreciate oceanographic data much more once they have first-hand experience with how difficult it is to design instruments and make sense of the readings.

Students designing a hydrometer.

Measuring (relative) density is by no means easy. There are a lot of conceptual things to understand when developing hydrometers – one question that comes up every time is what to mark. The first idea tends be to mark displacement on the cup – either a zero-mark without the hydrometer in the cup and then the water level once the hydrometer is floating in the water, or the level of the bottom of the hydrometer. Which makes it fairly hard to measure other samples than the ones the instrument was initially calibrated with.

The student group working on the task was faced with – and overcame – many difficulties. The straw was top-heavy, so in order to float more or less vertically, it had to be cut down. They had four different test solutions, but they did not know the densities of those solutions, only their salinities, hence they developed their own density scale relative to which they measured the density of their solution. Pretty ingenious!

Tasting sea water reloaded

Doing the “tasting sea water” activity again with a different group of students.

A very good introduction to the concept of salinity is the “tasting sea water” activity. Last time I ran that activity, students were very quick to correctly connect the samples with the correct sampling locations without much discussion going on. This time round, though, there was a lot of discussion. Students quickly sorted samples in order of increasing salinity, but there was no agreement to be found on whether the Baltic or the Arctic should be fresher. Since I only pointed to a location and didn’t specify the depth at which the sample had been taken, some students argued that the Arctic was very fresh at the very top, whereas the Baltic was brackish. Others said that the Baltic was a lot fresher than any oceanic location.

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Students tasting four different samples of “sea water” with salinities corresponding to Arctic sea ice, the Baltic sea, the open ocean and the Mediterranean. Samples have to be associated with locations on a map.

In another group, there was a big discussion going on about how in marginal seas, evaporation or precipitation can dominate.

It is always great to see how much you can discuss and learn from an activity as simple as this one!