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The ratio of the change in length or volumen of a body to the original lengthor volume for a unit change in temperature.

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Fluorescence

Absorption of high energy radiation by a substance and subsequent emission of visible light.

Hydrogen-Oxygen Fuel Cell

Fuel cell in which hydrogen is the fuel (reducing agent) and oxygen is the oxidizing agent.

 

Coordination Compound or Complex

A compound containing coordinate covalent bonds.

Nucleons

Particles comprising the nucleus, protons and neutrons.

Alkylbenzene

A compound containing an alkyl group bonded to a benzene ring.

Bubbles

Have you ever noticed that soap bubbles go up in winter and fall down in summer? The reason is that warm air is lighter than cold. And in winter the difference between the air temperature in the room (especially near the windows) and the one you exhale into the bubble is enough to overcome the heaviness of its shell.

Adhesive Forces

Forces of attraction between a liquid and another surface.

Safranine

Also called "phenosafranine". A purplish-red, water-soluble dye, C18H14N4, used for textiles and as a stain in microscopy.

Reducing Agent

The substance that reduces another substance and is oxidized.

Intermolecular Forces

Forces between individual particles (atoms, molecules, ions) of a substance.