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    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.

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

    2. When you open a bottle of beer, the air in the bottle suddenly depressurises, condensing into a tiny cloud of water vapour.

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

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

    5. When someone pulls you a pint, they are actually pushing the beer.

    6. Light that's bouncing inside the head on a pint is what makes it a different colour to the beer.

    7. And the size of the head on a pint decreases exponentially.

    8. Lipstick or greasy fingers can stop a good head forming.

    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).

    10. There’s about 2.5 pints of CO2 dissolved in a pint of beer.

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

    12. Hitting a bottle on top with another bottle causes a shockwaves which results in silly amounts of foam.

    13. Scientists use the same technology to monitor bubbles in beer as they do to monitor volcanoes.

    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.

    16. Freezing your beer will make it stronger.

    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.

    19. But if you don't have any plans to be an astronaut, you can buy beer brewed with actual moon dust.

    20. Beer could survive a nuclear apocalypse.

    21. And it might even be what allowed civilisation to thrive in the first place.