He is an expert in physics.

Kama is my best friend.

In physics, kerma is a unit of energy given by radiation to matter.

Radiation therapy is often used in cancer treatment.

What is the unit of measure for this product's weight?

We should use more renewable energy.

We are using LED bulbs for energy saving.

What is this material made of?

The nurse gave the patient medicine.

He is a professor of physics.