Answer
On the moon, the atmospheric pressure is zero since there is no atmosphere. If we tried to use a straw with a drinking glass on the moon, we could not create a lower pressure inside the straw. Therefore, we could not use a straw to drink from a drinking glass on the moon.
However, we could use a straw to drink from a sealed container that had a certain amount of pressure inside.
Work Step by Step
The reason that liquid gets pulled inside a straw is that we use the mouth to create a pressure that is lower than the atmospheric pressure around the glass.
On the moon, the atmospheric pressure is zero since there is no atmosphere. If we tried to use a straw with a drinking glass on the moon, we could not create a lower pressure inside the straw. Therefore, we could not use a straw to drink from a drinking glass on the moon.
However, we could use a straw to drink from a sealed container that had a certain amount of pressure inside.
