Which of the following is an intensive property?

Mass
Magnetism
Shape
Volume

I believe its A. Mass

Explanation:

An intensive property is a property of matter that depends only on the type of matter in a sample and not on the amount. For example, the electrical conductivity of a pure substance is a property that depends only on the type of substance. Silver, gold, and copper are excellent conductors of electricity, while glass and plastic are poor conductors.. Other intensive properties include color, temperature, density, and solubility.

c. heat could easily travel through the molecules in the air and escape/enter the flask. removing the air slows down the heat transfer.