Item AM042005: When a glass thermometer is placed in hot water, the level of liquid rises because the molecules get farther apart.

A glass thermometer has a colored liquid inside it. The level of colored liquid rises when the thermometer is placed in hot water.  Why does the level of liquid rise?

  1. Water molecules are pushed into the thermometer.
  2. Heat molecules push the molecules of the liquid upward.
  3. Heat causes the molecules of the liquid to get farther apart.
  4. The molecules of the liquid break down into atoms and take up more space.

Statistics for this item are available in the Original Project.

Notes
NGSS does not address thermal expansion or contraction of matter.