The ice cubes in the punch melted much faster. This is because of heat. Heat is actually a measure of matter's molecular
motion. In ice, molecules move slowly. In air, molecules move faster. In steam, the molecules are moving so fast that
they can escape into the air.
Heat can move around by radiation, conduction and convection. In our ice cube experiment, the heat moved very slowly
from the air into the ice cubes. The ice cubes in the punch melted faster because the heat moved more rapidly from the
water by both convection and conduction.
Newton once gave a party for fifty youngsters. He wanted to serve iced punch to all his guests. To save
time, Newton decided to have the punch glasses poured BEFORE the party.
He worried about the ice melting too soon and the punch becoming too warm. He couldn't decide what to
do so he tried an experiment.
He filled up one glass with BOTH the ice cubes and the punch.
He filled another glass with ONLY ice cubes so he could add the punch later.
Which ice cubes do you predict will last longer?
Scroll down to see the answer.
Reprinted with the permission from Ed Schevick Science Action Labs.