Exam: IELTS

Definition: A unit of measurement for the amount of light emitted by a source, or the open space within a tubular structure in biology.

Example: The lumen is used to measure the brightness of light bulbs.

Definition: A device that holds and provides light, often used in homes and buildings to illuminate spaces.

Example: The new luminaire in the living room brightened up the entire area.

Definition: The brightness or amount of light that comes from a surface or source.

Example: The luminance of the screen was adjusted to reduce glare.

Definition: A person who is well-known and respected in a particular area, often inspiring others with their achievements.

Example: She is considered a luminary in the field of science, inspiring many young researchers.

Definition: To give off light without heat, often in a way that is visible in the dark.

Example: The glow-in-the-dark stars on the ceiling luminesce at night, creating a magical atmosphere.

Definition: The process of producing light without heat, often caused by chemical reactions or other changes in matter.

Example: The glow of the fireflies is a beautiful example of luminescence in nature.

Definition: Able to produce or emit light without heat, often seen in certain materials or organisms.

Example: The luminescent jellyfish glowed in the dark ocean waters.

Definition: The quality or state of being bright or shining, often used to describe light or brightness in a scientific context.

Example: The luminosity of the star was measured to determine its distance from Earth.

Definition: Something that gives off or reflects light, making it bright and easy to see. It can also refer to ideas or writing that are clear and inspiring.

Example: The stars looked luminous against the dark night sky.

Definition: In a way that produces or reflects light; brightly or glowingly.

Example: The stars shone luminously in the night sky.