Question

Name the phase change in each of these events

(a) Dew appears on a lawn in the morning

(b) Icicles change into liquid water

(c) Wet clothes dry on a summer day.

Short answer

The phase change in each of these mentioned events is as follows:

1. From liquid to solid
2. From liquid to solid
3. From liquid to solid

Step-by-step solution

Step-1: Dew

Dew is the form of water droplets that appears on exposed objects in the morning and evening.

Step-2: Phase change

In the morning/ evening, due to a decrease in temperature, condensation takes place, thus water vapors that exist in the atmosphere condense to liquid water. This process converts the gaseous phase to the liquid phase.

Icicles

Icicles are solid hanging water formed by the freezing of dripping water.

Phase conversion

During this process, icicles which are the solid phase of water converts into liquid water.

Wet clothes in summer

Wet clothes consist of water. When they are allowed to dry in summer, the increase in temperature on a summer day converts liquid water to water vapor. This allows drying of the wet clothes.

Phase transformation

This is a simple process that uses solar energy to convert liquid water to gaseous water vapor.