Specific Gravity.
Upon what does the weight of a body, when in the air, depend?
The weight of a body depends upon the force with which it is drawn towards the earth.
What is this attractive force called?
It is called gravitation or gravity.
What is gravity?
Gravity is the weight of any body.
What is specific gravity?
Specific Gravity is the weight of any body, compared with an equal bulk of water.
Do substances weigh as much in water as they do in air?