News tagged with heat

Related topics: electricity

Debunking winter weather myths

(HealthDay)—A hot toddy may seem like a good way to stay toasty on a freezing day because it makes blood rush to your skin's surface. But drinking alcohol actually speeds heat loss, according to experts.

Jan 16, 2017
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Gas heater link to child illness

Gas heaters used for home heating have been found to increase the risk of respiratory illnesses in young children, according to the latest research from the University of Auckland.

Dec 20, 2016
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Polar vortex takes aim at US

(HealthDay)—A polar vortex is expected to bring extreme cold and winds to the central and eastern United States this week, and millions of Americans are being warned to guard against frostbite and hypothermia.

Dec 13, 2016
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Dehydration can lead to serious complications

Dehydration occurs when you use or lose more fluid than you take in, and your body doesn't have enough water and other fluids to carry out its normal functions. If you don't replace lost fluids, you will get dehydrated.

Sep 16, 2016
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Heat

In physics and thermodynamics, heat is the process of energy transfer from one body or system to another due to a difference in temperature. In thermodynamics, the quantity TdS is used as a representative measure of the (inexact) heat differential δQ, which is the absolute temperature of an object multiplied by the differential quantity of a system's entropy measured at the boundary of the object.

A related term is thermal energy, loosely defined as the energy of a body that increases with its temperature. Heat is also loosely referred to as thermal energy, although many definitions require this thermal energy to actually be in the process of movement between one body and another to be technically called heat (otherwise, many sources prefer to continue to refer to the static quantity as "thermal energy"). Heat is also known as "Energy".

Energy transfer by heat can occur between objects by radiation, conduction and convection. Temperature is used as a measure of the internal energy or enthalpy, that is the level of elementary motion giving rise to heat transfer. Energy can only be transferred by heat between objects - or areas within an object - with different temperatures (as given by the zeroth law of thermodynamics). This transfer happens spontaneously only in the direction of the colder body (as per the second law of thermodynamics). The transfer of energy by heat from one object to another object with an equal or higher temperature can happen only with the aid of a heat pump, which does work.

This text uses material from Wikipedia, licensed under CC BY-SA

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