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Browse the glossary using this index

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R

RDA

suggested amount of each nutrient which is needed daily to stay healthy.

Ray diagram

diagram that shows which way light rays travel

Reactants

substances that react together during a chemical change

Red blood cells

cells in the blood which carry oxygen around the body

Reflected ray

light ray that bounces off a surface

Reflects

light bounces off a surface

Refraction

bending of light when it moves from one material to another of different density

Repel

force pushing something away

Retina

light sensitive surface at the back of the eye

Rock cycle

a way (usually a diagram) of linking all the processes involved in the formation of rocks

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