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Explore It! Part 4
KESLER
SCIENCE
When a liquid changes into a gas this is called vaporization. There are two
kinds of vaporization. Evaporation - usually occurs on the surface and can
happen below boiling temperature and pressure. Boiling -
happens throughout the liquid once the liquid has reached a
certain temperature and pressure.
13.
Which kind of vaporization was demonstrated in the last slide?

By water evaporation from the leaves is created a negative pressure at the top of the tree that promotes the ascension  of the water through channels that are called xylem. there are also two molecule forces that are involved: the intra-water molecules cohesion (water molecules stick to each other) and the adhesion when the water molecules stick to the channels they are running in. this is what enables water to go from the roots to the top of a tall tree.