Question

For each action, consider the change in pressures and ignore any change in temperature. Does the density of the object increase, decrease, or remain the same?

A balloon full of helium rises 1000 feet.

a) density of helium decreases

b) density of helium stays the same

c) density of helium increases

A balloon full of helium is lowered to the bottom of a lake which is 100 feet deep.

a) density of helium stays the same

b) density of helium decreases

c) density of helium increases

A rock is dropped to the bottom of a lake which is 100 feet deep.

a) density of the rock increases

b) density of the rock stays the same

c) density of the rock decreases

Answer 1

Answer:-

1. a). The density of helium decreases because pressure decreases, so density also decreases.

2. c). density of helium increases as the pressure increases so the density also increases.

3. b). The density of of the rock stays the same because it is solid and pressure has no effect on the density of solid as it is incompressible.