Vectors have magnitude and direction; scalars have only magnitude

Steps:

• Define vectors as quantities with both magnitude and direction, scalars as having only magnitude.
• Evaluate each option: pressure (force per area, no direction), temperature (measure of heat, no direction), weight (gravitational force, has direction), work (energy transfer, scalar product).
• Identify weight as the only vector based on its directional nature.

Why C is correct:

• Weight is a force (mg, where g is gravitational acceleration vector), requiring both magnitude and direction per Newton's laws.

Why the others are wrong:

• A: Pressure is a scalar, defined as force per unit area without direction.
• B: Temperature is a scalar, measuring thermal energy without direction.
• D: Work is a scalar, calculated as force dot displacement (W = F · d).

Final answer: C