The change from liquid or solid phase to the vapor phase.


Related Terms

PLUGGING

1. Braking an electric motor by reversing its connections, so it tends to turn in the opposite direction; the circuit is opened automatically when the motor stops, so the motor does not actually reverse. 2. The formation of a barrier (plug) of solid material in a process flow system, such as a pipe or reactor.

PLASTIC DEFORMATION

Permanent change in shape or size of a solid body without fracture resulting from the application of sustained stress beyond the elastic limit.

PINT

Abbreviated pt. 1. A unit of volume, used in the United States for measurement of liquid substances, equal to 1/8 U.S. gallon, or 231/8 cubic inches, or 4.73176473 10 4 cubic meter. Also known as liquid pint (liq pt). 2. A unit of volume used in the United States for measurement of solid substances, equal to 1/64 U.S. bushel, or 107,521/3200 cubic inches, or approximately 5.50610 10 4 cubic meter. Also known as dry pint (dry pt). 3. A unit of volume, used in the United Kingdom for measurement of liquid and solid substances, although usually the former, equal to 1/8 imperial gallon, or 5.6826125 10 4 cubic meter. Also known as imperial pint.

PHOTOEMISSION

The ejection of electrons from a solid (or less commonly, a liquid) by incident electromagnetic radiation. Also known as external photoelectric effect.

PENCIL

An implement for writing or making marks with a solid substance; the three basic kinds are graphite, carbon, and colored.

PASTE MIXER

Device for the blending together of solid particles and a liquid, with the final formation of a single paste phase.

OILLESS BEARING

A self-lubricating bearing containing solid or liquid lubricants in its material.

NEUMANN-KOPP RULE

The rule that the heat capacity of 1 mole of a solid substance is approximately equal to the sum over the elements forming the substance of the heat capacity of a gram atom of the element times the number of atoms of the element in a molecule of the substance.

NAVIER'S EQUATION

A vector partial differential equation for the displacement vector of an elastic solid in equilibrium and subjected to a body force.

MOLE DRAIN

A subsurface channel for water drainage; formed by pulling a solid object, usually a solid cylinder having a wedge-shaped point at one end, through the soil at the proper slope and depth.

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