Question

At standard pressure, during which physical change does the potential energy decrease?

Answer 1

The potential energy of a gas decreases during a phase change, such as cooling and condensing to a liquid.

Step-by-step explanation:

The potential energy of a gas decreases during a phase change when a large amount of energy is extracted from the system and causes a decrease in the gas's volume, pressure, or both. For example, when a gas is cooled and condenses to a liquid, its potential energy decreases. This is illustrated by a graph of pressure vs. temperature, where the pressure of a gas continually decreases as it is cooled at a constant volume.

Answer 2

Answer is: cooling.

Cooling is change from liquids to solids.

Another example is crystalisation, many elements and compounds form crystals.

A physical change occurs when a substance changes phase.

Physical property can be observed and measured without any changes in molecular composition. The same substance is present before and after the change.