We have seen that we could have an equilibrium between water as a liquid and a solid by keeping the temperature at 0°C. What would you have to do to also have equilibrium with water as a gas?
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The Earth rotates once every 24 hours. As it turns, if you are standing on the Earth, the moon seems to rise and set every day. Now, imagine you are standing on the Moon. How often would the Earth rise and set?