Water is absorbed by

some materials.

Water beads up on

some material.

Q: Why does water make a

sponge expand?

Q: Does squeezing the dropper gently make the water

fall more slowly?

Q: Would water bead up more

easily (form better domes) on foil that

is not wrinkled?

Water forms a

dome on a flat surface.

Surface tension makes water form a sphere or a

dome.

Soap added to water reduces its

surface tension.

Q: Would the surface tension

be the same on a dime?

Q: What else could we add to water to change

its surface tension?

Water flows

DOWN a slope.

Bigger domes of water move down a slope

faster.

Water flows

faster down a steeper slope.

Q: How does water get clean?

Q: What stopped some of the water

drops from flowing down the

slopes?

Q: Can we speed up the flow by using another surface, like

glass?

Water

expands when

heated.

Water

contracts when cooled.