Suppose you keep two glass jars in the sun, one covered and one open, for the same period of time, will the temperature in the two jars be the same?

What you need:

Two jars, a thermometer and a glass lid.

What you do:

  • Place the two glass jars in the sun.
  • Place a thermometer in each jar.
  • Cover one of the jars with a glass lid. Let the jars stand in the sun.
  • Note the temperature after an hour.

What you find:

The temperature in the two jars is not the same. The covered jar shows a higher temperature.

Why?

Sunlight enters both the glass jars and heats them up. The heat goes out of the jars in the form of infrared rays. As infrared rays cannot pass through glass, the heat gets trapped in the jar that’s covered with the glass lid and hence the thermometer in the jar records a higher temperature.

 

Picture Credit : Google

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