Step-by-step explanation:
A permanent marker
2 activity set-ups to use for demonstration purposes (One will be identical to the children's, the other will include all steps but salt will be omitted.1 thermometer that is easily read, preferably in both Celsius and Fahrenheit, and that is safe for use by children
1 (7-ounce) cup or larger plastic container
1 (8-ounce) clear plastic cup
Enough foil to cover the top — but not the sides — of the cup
~5 cups of ice cubes (not crushed ice) (Make sure the ice cubes are loose and not stuck together.)
1 cup of crushed ice
~2 cups of rock salt (the kind used to make ice cream)
1 timer, stopwatch, watch, or clock with a second hand
Paper TowelsWater can exist in different states; ice is the solid state of water.
Physical properties are characteristics of a substance. They do not change. Physical properties include color, smell, freezing/melting point, and density.
The freezing point of water is the same as the melting point of ice: 32°F (0°C).
