hi everyone I'm Kate from nano girl and I can't wait to hit the beach this summer next time you're at the beach I've got an awesome science experiment that you can do because it's all about sea water now I've got three glasses of water in front of me this one is drinking water from the tap in my kitchen I'm going to put this egg into the water and let's see what happens it sinks straight to the bottom okay now this one is super salty water I put like five or six tablespoons of salt into this water so let's not drink this one and when I put another egg into this water oh what's gonna happen it floats straight away but the reason that egg floats in this salt water is because this salt water is more dense than my drinking water dense means that it has more stuff in it so when I added more salt to it that means that it can take the weight of the egg and that's what makes it float now this one is seawater from a beach near my house and we know that sea water is salty and that's why it tastes disgusting if you ever have to drink it now sea water is a little bit different from every Beach around New Zealand this is going to be different every time we do it but I'm gonna put another egg into this water and we're gonna see what happens so this is about half way between the two it's kind of floating but not really I think I can make the egg and this one float just by adding a little bit more salt so here we go I'm gonna start off with one spoonful of salt and give it a good stir so just by staring one spoonful of salt into my sea water I got this egg to float that means I increased the density of the sea water next time you're at the beach grab yourself a bucket of seawater and investigate how salty the sea is where you are have an awesome summer bye [Music] you [Music]