Observe temperature in Temperature and its Measurements – Class 7 Science Experiment

Chapter Name: Temperature and its Measurements

Activity Name: Observe temperature in Temperature and its Measurements

Activity Description:

Observe temperature in Temperature and its Measurements - Class 7 Science Experiment

This experiment involves observing the changes in the thermometer when it is dipped into hot water for one minute and then taken out to observe the mercury thread.

Required Items:

  1. A beaker
  2. Hot water
  3. Thermometer

Step by Step Procedure:

  1. Take a beaker and fill it with some hot water.
  2. Dip the thermometer into the hot water and leave it there for one minute.
  3. Record the temperature displayed on the thermometer while it is submerged in the water.
  4. Take the thermometer out of the water.
  5. Observe the mercury thread in the thermometer carefully.

Experiment Observations:

After some time, when the thermometer is taken out of the hot water, you may notice that the temperature reading on the thermometer starts to decrease gradually. This is because the thermometer is designed to measure the temperature of the surrounding medium, and as the thermometer is exposed to the cooler air outside the hot water, the temperature reading starts to drop.


  1. Handle hot water with care to avoid burns or accidents.
  2. Make sure the thermometer is clean and free from any contaminants before using it.
  3. Use a thermometer suitable for the temperature range of the experiment (in this case, it should be able to handle hot water temperatures).

Lesson Learnt from Experiment:

The experiment demonstrates that a thermometer is a useful instrument for measuring the temperature of the medium it is in contact with. However, it’s important to understand that the temperature reading on the thermometer can change if the medium’s temperature changes. When the thermometer is taken out of the hot water and exposed to cooler air, the temperature reading decreases accordingly.

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