Question

Give reason it is not proper to measure quantities by using body parts as units.

Answer 1

They can be. It would not be meaningless. Two thumbs length of a stick is easily defined in a pretty narrow range. Although you may get a two-thumb stick that is a tiny bit longer or shorter, it will never be an order of magnitude different. Cubits (elbow to fingertip, plus width of hand walked across a board) , feet (heel to toe walked across a room) and yards (cloth pinched and stretched out from nose) are great ways of getting good-enough measurements when a tape or rule isn't handy.

Answer 2

$\textbf {Reasons :-}$

1. There is no uniform measurement.

2. It may change According to persons.

3. There is no fixed value.

4. Measurement can not be taken in decimal places