Question

Which observation best demonstrates the surface tension of water? (1 point)
Responses

A small insect stands on a lake, without swimming or paddling.
A small insect stands on a lake, without swimming or paddling.

Water freezes at 0°C and boils at 100°C.
Water freezes at 0°C and boils at 100°C.

Water dissolves sugar, salt, and many other substances.
Water dissolves sugar, salt, and many other substances.

A stream flows around rocks and other obstacles, but always downhill.
A stream flows around rocks and other obstacles, but always downhill.

Answer 1

A small insect stands on a lake, without swimming or paddling.

This shows surface tension: cohesive forces among water molecules create a “skin” on the surface that can support the insect's weight.