Energy produced by the internal heat of the earth; geothermal heat sources include: hydrothermal convective systems; pressurized water reservoirs; hot dry rocks; manual gradients; and magma. Geothermal energy can be used directly for heating or to produce ...

An instrument used for the measurement of the reflecting, power (the albedo) of a surface. A pyranometer adapted for the measurement of radiation reflected from the earth's surface is sometimes employed as an albedometer.

A type of precipitation composed of unbranched crystals in the form of needles, columns, or plates. Usually has a very slight downward motion and may fall from a cloudless sky.

The International Convention for the Prevention of Pollution from Ships, 1973, as modified by the Protocol of 1978.

A non-crystalline semiconductor material that has no long-range order.

A pump for circulating the heat transfer fluid in a hydronic heating system.

An absolute temperature scale. ((

A single turn of rope when a rope is coiled down.

A metric unit of energy or work; the energy produced by a force of one Newton operating through a distance of one meter; 1 Joule per second equals 1 Watt or 0.737 foot-pounds; 1 Btu equals 1,055 Joules.

A condition within the letter of credit which restricts its negotiation to a named bank.

A thin metal disc partially evacuated of air used to measure atmospheric pressure by measuring its expansion and contraction.

International Medical Guide for Ships

The maximum possible voltage across a photovoltaic cell; the voltage across the cell in sunlight when no current is flowing.

Intimate mixture of oil and water, generally of a milky or cloudy appearance. Emulsions may be of two types: oil-in water (where water is the continuous phase) and water-in-oil (where water is the discontinuous phase).

A compressor cooled by atmospheric air circulated around the cylinders or casing.

The overall rate of heat loss from a building by means of transmission plus infiltration, expressed in Btu per hour, per degree temperature difference between the inside and outside.

A generic term for a glazed opening that allows daylight to enter into a building and can be opened for ventilation.

A list of investments in which a financial institution such as a mutual fund is authorised to.

A suitable beach, being steep and sandy, where ships could be careened for cleaning or repair.

A very sensitive electrostatic electrometer for measuring small potential differences.