Science, Maths & Technology
DIY: Taking the Caffeine Out of Tea
...C and, when the caffeine vapour cools, it re-forms the pure solid. It’s therefore a very convenient way of separating it from impurities (which don’t sublime). Another compound that sublimes is carbon dioxide. Although it’s a gas at normal temperatures and pressures, solid carbon dioxide won’t pass through a liquid stage as it warms up at atmospheric pressure....