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The pressure of the gas above a solution is proportional to the concentration of the gas in the solution.

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Atmosphere

A unit of pressure, the pressure that will support a column of mercury 760 mm high at 0 °C.

Differential Thermometer

A thermometer used for accurate measurement of very small changes in temperature.

Antibonding Orbital

A molecular orbital higher in energy than any of the atomic orbitals from which it is derived, lends instability to a molecule or ion when populated with electrons, denoted with a star (*) superscript or symbol.

Carbonium ion

An orgainic ion carrying a positive charge on a carbon atom.

Allotropic Modifications (Allotropes)

Different forms of the same element in the same physical state.

Oil

Liquid triester of glycerol and unsaturated fatty acids.

Molarity

Number of moles of solute per litre of solution.

Explosive

A chemical or compound that causes a sudden, almost instantaneous release or pressure, gas, heat and light when subjected to sudden shock, pressure, high temperature or applied potential.

Supersaturated Solution

A solution that contains a higher than saturation concentration of solute, slight disturbance or seeding causes crystallization of excess solute.

Ternary Compound

A compound consisting of three elements, may be ionic or covalent.