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Materials

cooking or outdoor thermometer
1 jar with lid (The thermometer must fit inside the closed jar.)
1 steel wool pad without soap
¼ cup (60 ml) vinegar
measuring cup (250 ml)

Procedure

• Place the thermometer inside the jar and close the lid. Record the temperature after 5 minutes.
• Soak one half of the steel wool pad in vinegar for 1 or 2 minutes.
• Squeeze out any excess liquid from the steel wool and wrap it around the bulb of the thermometer.
• Place the thermometer and the steel wool inside the jar. Close the lid.
• Record the temperature after 5 minutes.

Results

The temperature rises.

Why?

The vinegar removes any protective coating from the steel wool, allowing the iron in the steel to rust.
Rusting is a slow combination of iron with oxygen, and heat energy is always released. The heat
released by the rusting of the iron causes the liquid in the thermometer to expand and rise in the
thermometer tube.