Definition

1. Noun:
   • Photometer: A scientific instrument used for measuring the intensity of light or its photometric properties, such as luminance or illuminance.

Usage Examples

• Noun:
  • Nhà khoa học dùng quang kế để đo cường độ ánh sáng. (The scientist uses a photometer to measure light intensity.)
  • Quang kế là một dụng cụ quan trọng trong vật lý học. (A photometer is an important instrument in physics.)

Advanced Usage

• The term is technical and primarily used in scientific contexts like physics, astronomy, photography, and environmental science for precise light measurement.

Variants and Related Words

• Quang học (n): Optics, the branch of physics concerned with light.
• Đo sáng (v/n): To measure light / light metering.

Synonyms

• Light meter: A common synonym, especially in photography and general contexts.
• Photometric device: A more general technical term.

Notes

• "Quang kế" is a compound Sino-Vietnamese word derived from "quang" (light) and "kế" (meter, gauge). It is a specialized term with no common idiomatic or phrasal verb uses.