Avsnitt 8

When Napoleon marched huge forces across Europe, he needed an efficient way to store provisions. A Frenchman preserved sterilized food in empty champagne bottles, an idea modified by the British, who tried tin cans. Still, canned foods sometimes spoiled, which led to experiments with refrigeration . Later, it was discovered that gases may be stored at very low temperatures in a thermos flask, a device handy for picnics, for polar explorers and for, storing large quantities of liquid oxygen and hydrogen. When lit by a spark these gases can send rockets into space.