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Glossary results for "V"

vacuum

a region of space where there is no matter or energy

valve

a device that controls the flow of fluids

vanadium

a chemical element with the symbol V and atomic number 23

vapour

a substance that has turned from a liquid into a gas

variable

a quantity that can change

variable resistor

a resistor whose resistance can be changed

vegetable

a plant part that is eaten as food

vegetation

the plant life of a region

vehicle

a machine that moves people or goods from one place to another

vein

a blood vessel that carries blood back to the heart

ventilate

the process of exchanging air in a closed space

ventricle

a large chamber in the heart that pumps blood

Venus

the second planet from the Sun

vertebrate

animals that have a backbone

veterinary

relating to animals or their diseases

vibrate

a repetitive motion back and forth around a central point

Virgo

a modern constellation in the northern hemisphere, representing a maiden with a sheaf of wheat and featuring the bright star Spica

virologist

a scientist who studies viruses

virus

a non-living particle that can infect cells and cause disease

vitamin

nutrients that your body needs to stay healthy

vitamin D

a vitamin that helps your body absorb calcium and phosphorus

volcanology

the study of volcanoes

volt

a unit of electrical potential difference

voltage

a measure of the "pressure" that pushes electricity through a wire

voltmeter

a tool that measures the voltage between two points in an electric circuit

volume

the amount of space an object takes up

vulnerable

being open to attack or harm