Angle is a pure number and has no dimensions, while force, energy, and pressure all have dimensions.

Velocity is a vector quantity as it has both magnitude and direction, while mass, temperature, and speed are scalar quantities.

Thermal conductivity is a measure of a material's ability to conduct heat; it varies with material type.

A convex lens can form both real and virtual images depending on the position of the object relative to the focal point.

The law of conservation of energy states that energy cannot be created or destroyed, but it can be transformed from one form to another.

Gravitational fields are always attractive, pulling masses towards each other.

The uncertainty principle states that position and momentum cannot be precisely known at the same time.

Thermal conductivity is a measure of a material's ability to conduct heat; it varies with material and temperature.