Solids, Liquids and Gases

Temperature

• A measure of the warmth or coldness of an object or substance with reference to a standard value.

• The amount of heat energy contained in an object.

• The degree of hotness or coldness measured on a specific scale.

• A measure of the kinetic energy of particles in a substance.

Condensation

• The process by which water vapor in the air is changed into liquid water.

• The process of water evaporating into vapor.

• The process of water freezing into ice.

• The process of liquid water being absorbed by soil.

Evaporation

• The process by which water changes from a liquid to a gas or vapor.

• The process of water freezing into ice.

• The process of water condensing into liquid droplets.

• The process of water being absorbed by soil.

Liquid

• A state of matter with a definite volume but no fixed shape, and it can flow to fit the shape of a container.

• A state of matter that has a fixed shape and volume.

• A state of matter that has no definite shape or volume, and it expands to fill its container.

• A state of matter that is solid at room temperature and melts when heated.

Gas

• A state of matter consisting of particles that have neither a defined volume nor defined shape.

• A state of matter with a fixed volume but no fixed shape.

• A state of matter that has a defined shape and volume.

• A state of matter that is always solid at room temperature.

Melting

• The process by which a solid turns into a liquid by heating.

• The process of cooling a liquid to form a solid.

• The process of evaporating a liquid into gas.

• The process of mixing two solids together.

Solid

• A state of matter characterized by particles arranged such that their shape and volume are relatively stable.

• A state of matter where particles are far apart and move freely.

• A state of matter that has a definite shape but no definite volume.

• A state of matter that can be compressed easily.

Freezing

• The process through which a liquid turns into a solid when its temperature is lowered below its freezing point.

• The process of heating a solid until it becomes a gas.

• The process of a solid turning directly into a liquid without becoming a gas.

• The process of cooling a gas until it becomes a liquid.

Water cycle

• The continuous movement of water on, above, and below the surface of the Earth.

• The process of water freezing into ice and melting back into water.

• The evaporation of water from plants and soil into the atmosphere.

• The collection of water in rivers, lakes, and oceans.