Question: An Astronaut took water at 20°C and poured it into a beaker on the Moon. Tell me what will be the condition of the water.
Answer: The moon has no atmosphere. So the air pressure is also zero there. The boiling point of liquids on the moon is greatly reduced because the air pressure is zero. Consequently, if water at 20°C is poured into the astronaut’s beaker, there will be no pressure on the water other than the vapour pressure of water at 20°C. As the pressure on the water is low, the water will begin to boil quickly and collect the latent heat needed for evaporation from the water itself. As a result, the water in the rest of the beaker will rapidly decrease in temperature and the water will eventually freeze.