2. The temperature of a body, substance, or physical environment; especially, a relatively high temperature.
3. A form of transferred energy that arises from the random motion of molecules and which is felt as temperature; especially, as warmth or hotness.
Heat is transmitted by conduction, convection, or radiation.
It is an inhibition to the strength of this warming cukrrent. A disruption of this current caused by global warming could affect the relatively mild climate of northern Europe.
2. A contribution to the specific heat of a metal from the motion of conduction electrons.
2. Heat which is produced mainly by the decay of naturally occurring radioactive isotopes of thorium, potassium, and uranium in the earth's core.
3. An energy produced by tapping the earth's internal heat. At present, the only available technologies to do this are those that extract heat from hydrothermal convection systems, where water or steam transfer the heat from the deeper part of the earth to the areas where the energy can be tapped.
The amount of pollutants found in geothermal vary from area to area but may contain arsenic, boron, selenium, lead, cadmium, and fluorides. They also may contain hydrogen sulphide, mercury, ammonia, radon, carbon dioxide, and methane.
Getting the Earth's Heat
Geothermal power plants, which tap hot subterranean water or steam, are high on the lists of at least thirty states in the U.S. which are requiring utility companies to generate some portion of their electricity from such renewable sources.
Most utilities have not pursued geothermal energy primarily because up-front costs, including exploratory drilling, can be expensive since geothermal taps deep reservoirs, not groundwater, which collects much closer to the surface.
An extensive study recently released by the Massachusetts Institute of Technology has shown that the heat available under ground is surprisingly plentiful nationwide.
More information about special Geothermal Energy sources.
2. Etymology: from Old French rigor, from Latin rigorem, rigor, "numbness, stiffness", from "heat" + rigere, "to be stiff".
2. The amount of mechanical energy equivalent to a unit of heat.
3. The number of units of work or energy equal to one unit of heat; such as, 4.1858 joules, which equals one small calorie.
2. A voltage source consisting of a number of bimetallic junctions connected to produce a voltage when heated by a flame.
3. A high-temperature, molten-salt primary battery in which the electrolyte is a solid, non-conducting inorganic salt at ambient temperatures.d
When power is required, an internal pyrotechnic heat source is ignited to melt the solid electrolyte which allows electricity to be generated electrochemically for periods from a few seconds to an hour.This process is often used for military applications; such as, missiles, torpedoes, and space missions.
2. A severe and often fatal illness produced by exposure to excessively high temperatures; especially, when it is related to significant physical exertion.
It is usually experienced with elevated body temperature, lack of sweating, hot dry skin, and neurologic symptoms; including unconsciousness, paralysis, headache, vertigo, and/or confusion. In severe cases, very high fever, vascular collapse, and coma also develop.
2. Unstabilized or destroyed when exposed to high temperatures.
3. Easily altered, destroyed, or decomposed by heat.
2. The transfer of energy from one substance to another one.
The energy flow will always be from the warmer substance (with a higher temperature) to the cooler substance (at lower temperature).
Amounts of heat are expressed in energy units; such as, the calorie, the joule, and the BTU or British Thermal Unit which is about 252 calories and about 4.2 calories is a joule (the basic unit of energy in the meter-kilogram-second system).
The fluid is contained in a variety of loop (pipe) configurations depending on the temperature of the ground and the ground area available.
Loops may be installed horizontally or vertically in the ground or submersed in a body of water.
Usually no thunder is heard because of the distance from the observer.