Explanation

• Power is a scalar quantity because it has only magnitude.
• Power describes the rate of doing work in physics.
• It is measured in watts (W).

Additional information:

• Scalar quantities include: mass, time, temperature, energy.
• Vector quantities include: displacement, velocity, acceleration, force.

Last verified on 17-06-2026

Explanation

• Open vacuum tube is best for studying gas flow.
• It allows gas to enter and move inside the tube.
• Gas flow can be observed due to pressure difference.

Last verified on 17-06-2026

Explanation

• Low density liquid vaporizes first.
• Liquids with low density usually have weaker intermolecular forces.
• Weaker forces allow molecules to escape easily as vapor.
• High density liquids have stronger attraction and evaporate slowly.

Last verified 17-06-2026

Explanation

• Extensive property depends on the mass or size of the system.
• The value of an extensive property changes when the amount of matter changes.
• Examples include mass, volume, and total energy.
• If the mass doubles, extensive properties also increase.

Last verified on 17-06-2026

Explanation

• Toughness is the property that enables a material to withstand shocks, loads, and vibrations.
• Tough materials can absorb energy before breaking.
• Materials with high toughness resist sudden impacts and heavy forces.
• Brittleness causes materials to break easily under impact.

Last verified on 17-06-2026