21 Geeky Facts You Might Not Know About Beer, Explained By Physics

The Institute of Physics is running a campaign showing how physics affects your beer. Take notes, there will be an exam in the pub on Friday.

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1. Let's start with the basics: you should pour your beer into a glass that is at an angle.

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You want some bubbles, to create a head on the beer, but not too many or the beer will taste flat. So start by pouring into a glass that's tipped at a 45 degree angle to minimise foam, then finish by tipping the glass upright for the remainder of the pour. Job done!

3. The glass you drink out of affects the taste of your beer.

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The glass shape affects how much your hands warm up your beer, and the flavour of beer is affected by its temperature.

A thick glass, or one with a handle, protects your beer from the heat of your hands and keeps it cooler. Beers that taste better closer to room temperature prefer a chalice glass that the drinker can cup.

4. Did you ever notice that bubbles sink in a stout?

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But some of them are rising too. The ones in the centre rise, and this sets up a circulating current in the pint, dragging the liquid on the outside down. The bubbles are dragged down with it, so that's what you see.

9. Oxygen is the enemy of your beer.

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So CO2 is added to stop it going off. Otherwise the oxygen would cause it to oxidise and go off quicker (a bit like when you leave a bottle of wine open and it goes vinegary).

11. The bumps on the bottom of your beer bottle are there to make the bottle easier to move round the factory.

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The friction between the bottle and the conveyor belt needs to be just right so that the bottles don't tip over.

14. A temperature difference of a few degrees when making beer will result in drastically different flavours and colour of the final product.

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15. Humid weather makes your beer warm up faster.

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On a very humid day in Saudi Arabia, for example, a can of beer starting at 0°C would warm by around 9 °C in five minutes (not that anyone would be drinking beer in Saudia Arabia, of course.)

17. You can tell how alcoholic your beer is from how things float in it.

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The denser the beer, the less alcohol it contains. Breweries use a device called a hydrometer that floats in the beer to calculate the density of the beer and work out what percentage alcohol it contains.

18. Barley has been grown in space, meaning you could brew beer there if you really wanted to.

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And on a long duration mission to, say, Mars, with only a handful of crew, you're probably going to want to do that.

20. Beer could survive a nuclear apocalypse.

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During the Cold War, scientists dropped nuclear bombs on beer and soda to see how it would fare in an apocalypse. Surprisingly well, as it turns out. As long as it was at least 1270ft away from ground zero and wasn't hit by any flying debris, the beer was safe to drink.