Question

What does Boyle's law state about pressure and volume at a constant temperature and a constant pressure?

Pressure and volume will both increase together or both decrease together.

Pressure and volume will both increase as temperature and pressure increase.

Pressure increases when volume decreases.

Pressure and volume will both decrease as temperature and pressure decrease.

Answer 1

Option C: Pressure increases when volume decreases is the correct answer.

Explanation :

Boyle's law states that, the volume of the gas is inversely proportional to its pressure at a given constant temperature.

The pressure and volume are inversely proportional to each other. It means when the volume increases, pressure decreases & vice versa.

Example :

Take the respiration process.

The alveoli of lungs are the air spaces.

When we started to take air in, the thoracic cage expands, the size ( volume) increases. This will cause a drop of pressure in the alveoli ( intra alveolar pressure). This change results in the flow of air from atmosphere into the lungs.

The volume increases, the pressure falls.

If volume is decreased, results in increased pressure.

Option A: it is wrong. Volume & pressure inversely proportional. They won't both increase / decrease at a time.

Option B: it is wrong. They won't increase both & there is no change in the temperature. It is constant.

Option D: it is wrong. volume & pressure won't decrease at same time & temperature is constant. There is no change in the temperature.