# Which of the following examples involves an endothermic change?

## Which of the following examples involves an endothermic change?

Endothermic Processes Melting ice cubes. Melting solid salts. Evaporating liquid water. Converting frost to water vapor (melting, boiling, and evaporation, in general, are endothermic processes.

## How does pressure affect temperature and the state of matter?

Physical conditions like temperature and pressure affect state of matter. When the pressure exerted on a substance increases, it can cause the substance to condense. Decreasing pressure can cause it to vaporize. For some types of rock, decreasing pressure can also cause them to melt.

Which state of matter undergoes changes in volume most easily?

gaseous state of matter
The gaseous state of matter undergoes changes in volume most easily.

### What happens to a balloon when the pressure increases?

As it happens, in a rubber balloon, both the pressure and the volume will typically increase, since any increase in pressure will cause the balloon skin to expand, increasing the volume (and reducing the pressure) until the inward force exerted by the stretched balloon skin is balanced by the pressure of the gas inside it.

### What happens to the gas inside a balloon?

Now the gas inside the balloon has to create enough pressure to compensate for both the ambient pressure, and the elastic force trying to pull the balloon skin inwards.

Why do particles move closer together in a hot air balloon?

This makes sense because as the gas is warmed up, the particles speed up and get farther apart, which causes the container to expand. Near the end of the hot air balloon ride, the torch heating the air in the balloon is used less frequently. As the air in the hot air balloon cools, the particles slow down and move closer together.

## What happens at the end of a hot air balloon ride?

Near the end of the hot air balloon ride, the torch heating the air in the balloon is used less frequently. As the air in the hot air balloon cools, the particles slow down and move closer together. When the particles move closer together]