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Topic: Heat

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  CDC Extreme Heat | A Prevention Guide to Promote Your Personal Health and Safety
Heat exhaustion is a milder form of heat-related illness that can develop after several days of exposure to high temperatures and inadequate or unbalanced replacement of fluids.
Heat cramps are muscle pains or spasms—usually in the abdomen, arms, or legs—that may occur in association with strenuous activity.
Heat rash is a skin irritation caused by excessive sweating during hot, humid weather.
www.bt.cdc.gov /disasters/extremeheat/heat_guide.asp   (2330 words)

  Heat (physics) - MSN Encarta
Heat (physics), in physics, transfer of energy from one part of a substance to another, or from one body to another by virtue of a difference in temperature.
Heat is energy in transit; it always flows from a substance at a higher temperature to the substance at a lower temperature, raising the temperature of the latter and lowering that of the former substance, provided the volume of the bodies remains constant.
One Btu is the quantity of heat required to raise the temperature of 1 lb of water 1° F and is equal to 252 cal. Mechanical energy can be converted into heat by friction, and the mechanical work necessary to produce 1 cal is known as the mechanical equivalent of heat.
encarta.msn.com /encyclopedia_761575286/Heat_(physics).html   (949 words)

 FEMA: Are You Ready?
In extreme heat and high humidity, evaporation is slowed and the body must work extra hard to maintain a normal temperature.
Most heat disorders occur because the victim has been overexposed to heat or has over-exercised for his or her age and physical condition.
Although heat cramps are the least severe, they are often the first signal that the body is having trouble with the heat.
www.fema.gov /areyouready/heat.shtm   (995 words)

Heat may be defined as energy in transit from a high temperature object to a lower temperature object.
To describe the energy that a high temperature object has, it is not a correct use of the word heat to say that the object "possesses heat" - it is better to say that it possesses internal energy as a result of its molecular motion.
As illustrated in the heat and work example, the temperature of a gas can be raised either by heating it, by doing work on it, or a combination of the two.
hyperphysics.phy-astr.gsu.edu /hbase/thermo/heat.html   (607 words)

 Heat stroke signs, symptoms, and treatment by MedicineNet.com
Heat stroke is a form of hyperthermia (abnormally elevated body temperature) with accompanying physical and neurological symptoms.
The body normally generates heat as a result of metabolism, and the body is usually able to dissipate the heat by either radiation of heat through the skin or by evaporation of sweat.
However, in extreme heat, high humidity, or vigorous exertion under the sun, the body may not be able to dissipate the heat and the body temperature rises, sometimes up to 106 degrees Fahrenheit or higher.
www.medicinenet.com /heat_stroke/article.htm   (592 words)

 Heat - Succeed in Physical Science: School for Champions
Heat is the amount of thermal energy that is transferred between the two objects due to a temperature difference.
Heating an object is when you are transferring thermal energy to the object from to another object that is at a higher temperature.
Heat is often defined as energy in transit or the the flow of energy.
www.school-for-champions.com /science/heat.htm   (855 words)

 Heat Index
Heat kills by pushing the human body beyond its limits.
However, in the extreme heat and high humidity common in Louisiana, evaporation is slowed and the body must work extra hard to maintain a normal temperature.
Most heat disorders occur because the victim has been overexposed to heat or has over exercised for his or her age and physical condition.
www.ohsep.louisiana.gov /hlshazards/heatsindex.htm   (254 words)

 Physics Demonstrations - Heat
Although heat at first appears to have nothing to do with motion, it is now understood that heat is the motion of molecules.
The heat of vaporization of water is 540 calories per gram, and the heat of fusion of water is 80 calories per gram.
Heat radiation is a form of electromagnetic wave in the infrared portion of the spectrum.
sprott.physics.wisc.edu /demobook/chapter2.htm   (11867 words)

Heat is a way of transferring energy between a system and its surroundings that often, but not always, changes the temperature of the system.
The heat capacity of a substance is the amount of heat required to raise the temperature of a defined amount of pure substances by one degree (Celsius or Kelvin).
Heat that raises the temperature of the system can be sensed, but heat that results in a change in the state of the system ­ from solid to liquid or from liquid to gas ­ is latent.
chemed.chem.purdue.edu /genchem/topicreview/bp/ch5/heat.html   (592 words)

 Coping with a Heat Wave
However, in extreme heat and high humidity, evaporation is slowed and the body must work extra hard to maintain a normal temperature.
Heat cramps: Heat cramps are muscular pains and spasms due to heavy exertion.
Although heat cramps are the least severe, they are often the first signal that the body is having trouble with the heat.
www.disastercenter.com /guide/heat.html   (2303 words)

 Understanding Heat-Related Illness -- the Basics
Heat exhaustion, heat cramps and heat stroke all occur when your body cannot cool itself adequately.
Heat exhaustion occurs when the body loses large amounts of water and salt through excessive sweating, particularly through hard physical labor or exercise.
The most serious of the heat-related illnesses, heat stroke occurs when the body suffers from long, intense exposure to heat and loses its ability to cool itself.
www.webmd.com /a-to-z-guides/understanding-heat-related-illness-basics   (496 words)

 Heat Cramps, Heat Exhaustion, and Heat Stroke
Heat cramps are muscle contractions, usually in the gastrocnemius or hamstring muscles (the muscles at the back of the calves).
The signs of heat exhaustion include paleness, dizziness, nausea, vomiting, fainting, and a moderately increased temperature (101-102 degrees F) which, in this case, is not truly a fever, but caused by the heat.
As long as blood is flowing properly to your skin, extra heat from the core of your body is "pumped" to the skin and removed by sweat evaporation.
www.drreddy.com /heat.html   (1113 words)

 MedlinePlus: Heat Illness
The primary NIH organization for research on Heat Illness is the National Institute on Aging
Heat rash - skin irritation from excessive sweating
Article: Is previous thoracic sympathectomy a risk factor for exertional heat...
www.nlm.nih.gov /medlineplus/heatillness.html   (379 words)

 Heat Illness
The result may be heat illness, which can come in the form of heat cramps, heat exhaustion, or heatstroke.
Heat cramps are brief, severe cramps in the muscles of the legs, arms, or abdomen that may occur during or after vigorous exercise in extreme heat.
Heat exhaustion is a more severe heat illness that can occur when a person in a hot climate or environment hasn't been drinking enough fluids.
www.kidshealth.org /parent/firstaid_safe/emergencies/heat.html   (551 words)

 American Red Cross
Heat wave: Prolonged period of excessive heat and humidity.
Heat index: A number in degrees Fahrenheit (F) that tells how hot it really feels when relative humidity is added to the actual air temperature.
Although heat cramps are the least severe, they are an early signal that the body is having trouble with the heat.
www.redcross.org /services/prepare/0,1082,0_243_,00.html   (812 words)

  Heat shade Grizzlies on Posey's bucket - USATODAY.com   (Site not responding. Last check: )
Miller had 22 to lead Memphis, while Rudy Gay added 20, including a pair of free throws in the final 22 seconds to give Memphis a 97-95 lead and set the stage for the last-second shot.
The Heat swingman, in his second year out of South Kent Prep, is the youngest player on the Miami roster.
Heat C Alonzo Mourning had seven blocks, a season-high for a Memphis opponent, including five rejections in the third quarter.
www.usatoday.com /sports/basketball/games/2006-12-02-heat-grizzlies_x.htm   (703 words)

  Heat - Wikipedia, the free encyclopedia
The amount of heat exchanged during a phase change is known as latent heat and depends primarily on the substance and the initial and final phase.
Heat is a process quantity—as opposed to being a state quantity—and is to thermal energy as work is to mechanical energy.
Heat flows between regions that are not in thermal equilibrium with each other; it spontaneously flows from areas of high temperature to areas of low temperature.
en.wikipedia.org /wiki/Heat   (2465 words)

 Heat Acclimatization
The primary benefit of heat acclimatization is improved tolerance of exercise in the heat, evident as a reduction of the incidence or severity of symptoms of heat illness, and increased work output concurrent with reduced cardiovascular, thermal, and metabolic strain.
Heat acclimatization is of interest to physicians as well as athletes, because it reduces the incidence of heat illness and the intensity of symptoms.
Heat cramps are usually unheralded and occur in the voluntary muscles of the legs, arms, and abdomen, after several hours of strenuous exercise in individuals who have lost a large volume of sweat, have drunk a large volume of hypotonic fluid, and who have excreted a small volume of urine.
www.sportsci.org /encyc/heataccl/heataccl.html   (2227 words)

 heat - Hutchinson encyclopedia article about heat   (Site not responding. Last check: )
The specific heat of a substance is the amount of heat that is needed to raise the temperature of 1 kg of the substance by 1 K (°C).
Conduction is the passing of heat along a medium to neighbouring parts with no visible motion accompanying the transfer of heat; for example, when the whole length of a metal rod is heated when one end is held in a fire.
Convection is the transmission of heat through a fluid (liquid or gas) in currents; for example, when the air in a room is warmed by a fire or radiator.
encyclopedia.farlex.com /heat   (393 words)

 What Are Heat Pipes?   (Site not responding. Last check: )
A traditional heat pipe is a hollow cylinder filled with a vaporizable liquid.
Heat is released from the upper part of cylinder to the environment; vapor condenses to liquid phase.
Because some heat has been removed from the air before encountering the evaporator coil, the incoming air stream section is called the precool heat pipe.
www.heatpipe.com /heatpipes.htm   (187 words)

Heat is commonly measured in calories, although the joule is preferred.
Specific heat is a measure of how much heat is required to raise the temperature of a unit of mass of a substance by one degree.
Heat is energy that raises the temperature of a thing by causing the molecules in that thing to move faster.
www.iit.edu /~smile/ph9615.html   (761 words)

 Define heat - a definition from Whatis.com
Heat is the transfer of kinetic energy from one medium or object to another, or from an energy source to a medium or object.
The standard unit of heat in the International System of Units (SI) is the calorie (cal), which is the amount of energy transfer required to raise the temperature of one gram of pure liquid water by one degree Celsius, provided the water temperature is higher than the freezing point and lower than the boiling point.
Heat by conduction takes place when two material media or objects are in direct contact, and the temperature of one is higher than the temperature of the other.
whatis.techtarget.com /definition/0,,sid9_gci771825,00.html   (433 words)

 Heat conduction   (Site not responding. Last check: )
Gradient heat transport depends on three quantities: the conductivity of the material, the cross-sectional area of the material, and the spatial gradient of temperature.
Heat flow in the y-direction is assumed to be negligible, and variations in the cross-sections of the bars are taken into account by characterizing the conductivity C(x)of each bar a function of position.
Heat is applied to the bar at x=0 in one of three ways: as constant temperature, as constant heat flux, or as sinusoidal temperature.
www.jhu.edu /~virtlab/conduct/conduct.htm   (339 words)

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