expansion

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expansion,

in physics, increase in volume resulting from an increase in temperature. Contraction is the reverse process. When heat is applied to a body, the rate of vibration and the distances between the molecules composing it are increased and, hence, the space occupied by the body, i.e., its volume, increases. This increase in volume is not constant for all substances for any given rise in temperature, but is a specific property of each kind of matter. For example, zinc and lead undergo greater expansion in a one-degree rise in temperature than do silver or brass. Since solidssolid,
one of the three commonly recognized states in which matter occurs, i.e., that state, as distinguished from liquid and gas, in which a substance has both a definite shape and a definite volume.
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 have a definite shape, each linear dimension of the solid increases by a proportional amount for a given temperature increase. The amount that a unit length along any direction of a substance increases for a temperature increase of one degree is called the coefficient of linear expansion of the substance. Most liquids also expand when heated. However, since liquids do not have a definite shape, it is the expansion of their volume as a whole that is relevant rather than the increase in a linear dimension. The amount of expansion that a unit volume (e.g., a cubic centimeter or a cubic foot) of any substance undergoes per one-degree rise in temperature is called its volume coefficient or coefficient of cubical expansion and is listed as a property of that substance. The coefficient of linear expansion can be calculated by dividing the coefficient of cubical expansion of the substance by three. When the amount of expansion of a given length of a substance has been determined experimentally, the linear coefficient is calculated by dividing the total amount of expansion by the product of the original number of length units and the number of degrees of rise in temperature. Gases also exhibit thermal expansion. The coefficient of expansion is about the same for all the common gases at ordinary temperatures; it is 1-273 of the volume at 0°C; per degree rise in temperature. The Kelvin, or absolute, scale is based upon this behavior (see Kelvin temperature scaleKelvin temperature scale,
a temperature scale having an absolute zero below which temperatures do not exist. Absolute zero, or 0°K;, is the temperature at which molecular energy is a minimum, and it corresponds to a temperature of −273.
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). Charles's law concerning the expansion of gases states that the volume of a gas is directly proportional to its absolute temperature (see gas lawsgas laws,
physical laws describing the behavior of a gas under various conditions of pressure, volume, and temperature. Experimental results indicate that all real gases behave in approximately the same manner, having their volume reduced by about the same proportion of the
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). Liquids differ from each other as do solids in their expansion coefficients. Water, unlike most substances, contracts rather than expands as its temperature is increased from 0°C; to 4°C;; above 4°C; it exhibits normal behavior, expanding as the temperature increases.

expansion

[ik′span·shən]
(electronics)
A process in which the effective gain of an amplifier is varied as a function of signal magnitude, the effective gain being greater for large signals than for small signals; the result is greater volume range in an audio amplifier and greater contrast range in facsimile.
(mathematics)
The expression of a quantity as the sum of a finite or infinite series of terms, as a finite or infinite product of factors, or, in general, in any extended form.
(mechanical engineering)
Increase in volume of working material with accompanying drop in pressure of a gaseous or vapor fluid, as in an internal combustion engine or steam engine cylinder.
(physics)
Process in which the volume of a constant mass of a substance increases.

expansion

The increase in length or volume of a material, or a body, caused by temperature, moisture, or other environmental condition.

expansion

1. Maths
a. the form of an expression or function when it is written as the sum or product of its terms
b. the act or process of determining this expanded form
2. the part of an engine cycle in which the working fluid does useful work by increasing in volume
3. Physics the increase in the dimensions of a body or substance when subjected to an increase in temperature, internal pressure, etc.
References in periodicals archive ?
Table 2 compares the median values of PM, ROA, ROE, P/E, P/Sales, and M/B across the expansionary and the contractionary monetary policy periods.
Normally, central banks adopt expansionary monetary policy in recession to uplift economic activities but keep their eyes on targeted inflation as well.
Interestingly, just like the Bundesbank, which says the ECB should increase interest rates, the neocons mentored by Brzezinski also say that the Fed should increase interest rates in the US and end expansionary monetary policies.
7% of GDP All in all the overall outlook details a shift in the economy from expansionary to contractionary fiscal proceedings.
A MORE EXPANSIONARY FISCAL POLICY IN 2013 WILL REQUIRE A MORE CONTRACTIONARY FISCAL POLICY IN 2014-2016
Should other countries resort to economic growth, Taiwan cannot make an exception and have to consider expanding public construction or adopting expansionary financial policy, to cope with the situation.
If there was ever a place where expansionary austerity should work well - where private investment and exports should stand up as government purchases stood down, confirming its advocates' view of the world - it is Britain today.
We still find this to be an expansionary budget," said Monica Malik, chief economist at investment bank EFG-Hermes in Dubai, adding that actual spending might rise about 11 percent next year after a 23 percent jump this year.
The ICCI President said that the new monetary policy was not an expansionary policy rather it is the continuation of the contractionary monetary policies adopted by the SBP for the last three years, which proved seriously damaging for the business activities.
It used three economic scenarios: contractionary - (56,000 new workers), baseline (100,000 new workers), and expansionary (135,000 new workers).
The move comes in line with the bank's expansionary strategy locally and globally.
This makes additional hikes likely, given the government's expansionary fiscal stance and strong possibility that it will miss key revenue and deficit targets.