Name one quantity which determines the purity of a substance?

Which factors determine the state of a substance?

Some quantity of heat is given to a substance. The quantity which determines the temperature of the body is

Name the physical quantity which determines the loudness of sound ?

Name the quantity which determines loudness, pitch and quality of a sound.

Name the organ which test the purity of water in mollusca.

Why is melting point of a substances used as a criterion for testing the purity of a substances?

Name the instrument used for determining the purity of a sample of milk.