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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O

Ohm’s law

Ohm’s law states that the current through a conductor between two points is directly proportional to the potential difference or voltage across the two points, and in reverse proportional to the resistance between them.

Oil

Any of a group of fats that is a liquid at room temperature that are obtained from plants.

Omnivores

Ominivores are animals who eat a mixture of plants and meat.

Opaque

Things are opaque if light cannot pass through them.

Optic nerve

The optic nerve transmits visual information from the retina to the brain.

Optical illusion

An optical phenomenon that results in a false or deceptive visual impression.

Optician

A specialist in fitting eyeglasses and making lenses to correct vision.

Oscillator

A tuned electronic circuit used to generate a continuous output repetitive variation, typically in time.

Oscilloscope

An electronic device with a screen, which displays a picture of the voltage of an electrical signal. When this device is connected to the output of an audio amplifier, it displays patterns related to the sound pressure coming out of the loudspeaker.

Osmosis

Osmosis is the diffusion of a liquid through a cell wall or membrane. Osmosis is the means by which water and nutrients move.

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