For which applications would you choose a liquid over a gas or solid?

Liquids are useful for washing clothes and painting a wall because they flow and can spread over surfaces. A car’s brakes use liquid brake fluid to transmit force from the pedal to the brake pads. Sugar dissolves in a liquid such as water. A gas is better for deodorizing a whole room because it spreads through the air, while a solid is suitable for carving or making a gear.

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