Definition

A tool used to measure the strength of radiant energy, which can include light and other forms of electromagnetic radiation.

Example

The scientist used a radiometer to measure the intensity of sunlight in the experiment.

Conversation

Have you ever seen a radiometer?

No, I haven’t! What is it used for?

It's a cool device that measures radiant energy.

That sounds interesting! I’d love to see one in action.

Synonyms & Antonyms

Root Explanation

Radiometer → It is formed from "radius" (from Latin, meaning ray or beam) and "-meter" (from Greek "metron", meaning measure). The word "radiometer" refers to an instrument that measures radiation or rays of energy.

Memory Tip

Think of measuring rays or beams of energy with a device — that's what a radiometer does.

Visually Confused Words