Question

Which of the following can be characterized as a physical change?

A. a copper pipe rusts
B. milk goes sour
C. firewood burns
D. sweat evaporates from your skin

Answer 1

D. Sweat evaporates from your skin

Step-by-step explanation:

A physical change is a reversible process, no new substance is formed. A physical change does not affect the chemical composition of a substance.

Sweat evaporation from the skin is a physical change, because the change that occur is merely a change of state, Liquid to Gaseous state, no new substance is formed.