Abottle of water left open for several days is now empty . why ?

condensation?

Explanation:

the water was like, welp, time to go these people dont love me :) then tny drops left in groups (cuz some still had hope that you would return) and went up into the clouds and sky, went searching for their new lover, and then wherever they found them, they cried of enjoyment and rained all over, or on the mountain to return to the lake with the plenty of fish in the sea until they were ready to find new love :)

True

The number of molecules hitting the unit surface per unit time increasethe gas pressure increases.