1.all substance undergoes thermal expansion ,it's_______.

A. true
B.false
C. Neither
D. Either true or fals


2. the decrease in temperature of a substance indicates that ________.

A.The number of particles in it decreases
B.the average velocity of its particles increases
C.the average potential energy of particles decreases
D.the average kinetic energy of its particles decreases


3.The normal body temperature is 37⁰C What is the Fahrenheit?

A.32⁰F
B.99⁰F
C.212⁰F
D.373⁰F



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