Question

Name the old devices of measurement. What were their disadvantages?

Answer 1

Old devices of measurement were parts of our body such as handful, arm length and footsteps, and sand clock and candle clock were used to determine the time.

Disadvantages of old devices:

(i) Handful, arm length and footsteps are different for different people.

(ii) Measurement was not accurate.

Disadvantages of candle clock:

(i) Duration of two events is different due to use of different materials in candle.

(ii) It also depends on the condition of the environment.