Good thing laboratory equipment is always labeled with the volume! Even though I have played plenty with Legos as a child and am fairly good at 3D stuff, my mind just can’t estimate these volumes correctly. To me, the 500 ml cylinder looks a lot larger than 1 l volumetric flask and it blows my […]
Sometimes waves are very regular and mostly of the same length. Those are the ones that I usually talk about when I talk about interference of waves. But of course, other times, there are different kinds of waves with different histories and different lengths, and those do interfere, too. For example in the picture below, […]
Remember how we talked about how waves seem to propagate extremely slowly into that calm patch that occurs when a boat pulls away from a dock? Well, the other day I noticed that there is even more physics you can see when watching a similar situation: You see how long waves propagate much faster than […]
So in my previous post we deployed a mooring (in fact, those pictures were from the deployment of several different moorings). Now how do we get such a monster back on board again? Recovering a mooring is always slightly nerve-wracking, because even though we’ve tried very hard to forget about this possibility during the year […]
Do you want to know the full story behind the rope in the mystery picture the other day? On the recent Håkon Mosby cruise, we did a lot of mooring work, and that rope was part of a mooring that we recovered after it has been out in the Iceland Sea for two years. So […]
Back by popular demand: Reading the water in my mystery pictures series! Who knows what’s going on in the picture below? You might recognize a couple of details that might give you a hint: There are waves parallel to the rope and drops of water falling from the rope. And here is what happened: A […]
So now we have prepared our sea water sample and are ready to start titrating to figure out the concentration of dissolved oxygen. The sample itself changes color with added thiosulfate, it goes from yellow to lighter yellow to clear over a wide range of added thiosulfate. But determining the titration volume just based on […]
So how do we actually measure dissolved oxygen concentrations from the samples we took in the last post? We are using a method called “titration” to determine the unknown concentration of dissolved oxygen in our sea water sample. And this is how titration works in general: During titration, we add known volumes of a chemical, […]
Since my task on the recent Håkon Mosby cruise was to measure dissolved oxygen, I will give an overview over how that is done over the next couple of posts. Starting with today’s post on how to sample (because this isn’t as simple as just filling a bottle with sea water!) In fact, sampling oxygen […]
So you might have noticed that the last 6 weeks or so all posts had been scheduled ahead and that I was strangely absent. Yep. That’s because I was on a research cruise in the Nordic Seas. But be assured – we’ll be talking about that for the next couple of posts! First, let’s get […]
