Primary General Science Glossary

This is a general primary science glossary. For class specific glossaries please go to the specific subjects


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D

Deciduous trees

Deciduous trees are those that shed their leaves in winter; their leaves are usually wide and flat.

Dehydration

Dryness resulting from the removal of water.

Density

The amount of matter contained by a given volume. The symbol of density is ρ (the Greek letter rho)

Desiccant

A substance that promotes drying.

Detergent

A detergent is a material intended to assist cleaning. The term is sometimes used to differentiate between soap and other surface-active chemical cleaning agents widely used in industry and laundering.

Dew point

The temperature at which the water vapour in the air becomes saturated and condensation begins. Dewpoint is expressed as a temperature in degrees Fahrenheit or Celsius.

Dextrin

Dextrin is obtained by hydrolysis of starch. It is a tasteless, odourless gummy substance that is often used as a thickening agent, in adhesives and in dietary supplements.

Diffusion

The process by which a substance moves from an area of high concentration, through a barrier or membrane, to an area of lower concentration.

Digestive system

The digestive system is made up of all the organs that help the body break down and process the food we eat.

Diopter

A unit of measurement of the refractive power of a lens, which is equal to the reciprocal of the focal length measured in meters.

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