a straw in the water. clear plastic wrap around the glass. a thermometer in the water. black material around the glass.
Students want to raise the temperature of water in a glass jar. The jar is on a table in full sunlight. The fastest way to increase the temperature without using a hot plate is to place

Options:
- a straw in the water.
- clear plastic wrap around the glass.
- a thermometer in the water.
- black material around the glass.

black material around the glass.