# ABSOLUTE EXPANSION

 The true expansion of a liquid with temperature, as calculated when the expansion of the container in which the volume of the liquid is measured is taken into account; in contrast with apparent expansion.

## Related Terms

### ARCOMETER

A device for determining the density of a liquid by measuring the apparent weight loss of a solid of known mass and volume when it is immersed in the liquid.

### MATTHIESSEN SINKER METHOD

A method of determining the thermal expansion coefficient of a liquid, in which the apparent weight of a sinker when immersed in the liquid is measured for two different temperatures of the liquid.

### COOLING METHOD

A method of determining the specific heat of a liquid in which the times taken by the liquid and an equal volume of water in an identical vessel to cool through the same range of temperature are compared.

### COEFFICIENT OF CUBICAL EXPANSION

The increment in volume of a unit volume of solid, liquid, or gas for a rise of temperature of 1 at constant pressure. Also known as coefficient of expansion; coefficient of thermal expansion; coefficient of volumetric expansion; expansion coefficient; expansivity.

### BARREL

A unit of liquid volume of petroleum oils equal to 42 U.S. gallons or approximately 35 Imperial gallons.

A tube attached to a container of liquid at an orifice to facilitate or regulate outflow.

### BALANCING RESERVOIR

A holding basin in which variation in flow and composition of a liquid are averaged. Such basins are used to provide a flow of reasonably uniform volume and composition to a treatment unit.

### LIQUID-IN-GLASS THERMOMETER

A thermometer in which the thermally sensitive element is a liquid contained in a graduated glass envelope; the indication of such a thermometer depends upon the difference between the coefficients of thermal expansion of the liquid and the glass; mercury and alcohol are liquids commonly used in meteorological thermometers.

### BLOWING

The introduction of compressed air near the bottom of a tank or other container in order to agitate the liquid therein.

### GAMMA-RAY LEVEL INDICATOR

A level indicator in which the rising level of the liquid or other material reduces the amount of radiation passing from a gamma-ray source through the container to a Geiger counter or other radiation detector.

### Related questions

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