 Today we're going to be measuring the density of beer. Now the procedure that I'm going to be doing works actually with any type of liquid. First what we need to do is we need to know the mass of the liquid. Now liquids always come with their containers, so we're going to measure the mass with the container and then from that we're going to extract the mass of the container and that will give me the mass of liquid. Once I have that I can calculate my density as mass over volume. First of all I'm going to start measuring the mass of my container. I'm going to be using a glass of which I know the amount of liquid that it can hold. Here it says 0.5 liters. Some of your kitchen scale maybe have a zero button so you could skip this step, but in case you don't have this I'm going to do the complete step-by-step approach here. So I have 759 grams for my container. Now comes the fun step. We're going to add the liquid. So now I can measure the mass with the liquid inside and what I get is 1255 grams. So what I have to do now, I have to subtract the 759 from the 1255, so 1255 minus 759 gives me 496 grams. And now I can do by calculation mass of the beer 496 gram over my volume. On my glass it indicates it can hold up to the line where I filled it to 0.5 liters with one significant figure. Usually densities are given in grams per millilitre, so I'm going to convert that to millilitre. So 1000 millilitre is a liter, so half a liter is 500 millilitre. I'm going to calculate this 496 divided by 500 and I get 0.992. Now due to the rules of significant figures, I have one, two, three significant figures here. I have only one significant figure down here. I couldn't measure it more precise than that. I will have to round this to one significant figure. So the answer is around one one gram per millilitres. Now if I go online and I google this apparently depends on the type of beer that I'm using, but all of them are within the one gram per millimetre. Of course my measurement here is not very precise because I only have one significant figure on my measuring device here. So I'm a bit limited but I get in the correct order of magnitudes. If I look it up, it is around one grams per millilitre. If you don't have a kitchen scale to do this, maybe you can do this also on a regular scale. What you have to do here is you will have to stand on the scale with the beer in your hand and then you take the mass of the liquid plus the container plus you and then you measure yourself again. Only holding the empty container and you will get the mass of the container plus you which you subtract over here and you should get in the same order. The higher the volume that you're taking, the more precise it will be with that scale. However, the limit right now here is my device here which only had one marking at 0.5 liters which created a low amount of significant figures which then only gave me an answer with one significant figure.