Question

1. Pressure is described as ___ per unit area. a. Flow b. Pounds c. Force d. Inches 2. Pressure is increased when: a. The number of molecules per unit area is decreased Heavier molecules per unit area are introduced b. c. Molecules begin to move faster d. The number of molecules are spread out over a larger ur 3. Atmospheric pressure at sea level is__ _psia? a. 0 b. 2 C. 14.7 d. 27.73

Answer 1

1. Pressure is described as ___ per unit area.

a. Flow

b. Pounds

c. Force

d. Inches

The correct answer is c. Force. Pressure is the force exerted per unit area.

2. Pressure is increased when:

a. The number of molecules per unit area is decreased

b. Heavier molecules per unit area are introduced

c. Molecules begin to move faster

d. The number of molecules are spread out over a larger area

The correct answer is c. Molecules begin to move faster. When molecules move faster, they collide with surfaces more frequently and with greater force, resulting in an increase in pressure.

Atmospheric pressure at sea level is __ psia?

a. 0

b. 2

c. 14.7

d. 27.73

The correct answer is c. 14.7. Atmospheric pressure at sea level is approximately 14.7 pounds per square inch absolute (psia).