Demonstrate an activity to explain boiling point of water. Also draw a neat labelled
diagram and define the terms involved (Latent heat, Latent heat of vaporisation etc)
Answers
Given:
Experiment
To find:
Explain boiling point of water
Solution:
(a) To demonstrate: an activity to explain boiling point of water and a neat labelled diagram
Step1:
Take 100ml of water in a test tube, cover its mouth a two-holder stopper. Fix thermometer to one of the holes in the cork and a glass tube through the another one in such a way that it hangs in air.
Step2:
Take a burner or spirit lamp to heat the water. keep the wire gauze on the tripod stand and place the test tube over it.
Step 3:
Take thermometer reading after fixed regular intervals of time (3 minutes). Once the temperature rises above 80°C, reduce the time interval to check temperature increase.
Step 4:
Take the reading at the point when the water starts boiling and take at least 4-5 readings even after the boiling. Water starts boiling at 100°C.
(b) To define the terms involved: latent heat, latent heat of vaporization, etc.
Latent heat:
It is the energy required to convert liquid or solid into vapor or liquid without the change of temperature.
Latent heat of vaporization:
It the amount of energy required to convert one mole of liquid into gas at its boiling point.
Boiling point of Water:
It is the temperature at which water starts to change into vapors. It is 100° C at 1 atmospheric pressure. It depends on atmospheric pressure.