News tagged with heat

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Looking for ways to stay cool during heatwaves

As sunbathers enjoy this week'’s hot weather, scientists at the University of Brighton are researching ways the elderly can avoid heat-related illnesses which claim 2,000 lives in the UK each year.

Aug 26, 2016
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Heat waves hit seniors hardest

(HealthDay)—As much of the Northeast struggles with a heat wave that isn't expected to ease until the middle of this week, here are some expert tips on how to spot heat stroke.

Aug 16, 2016
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Does drinking hot tea in summer really cool you down?

I remember as a child, on the rare warm days that we used to get in Britain, my grandmother telling me to "have a cup of black tea … it will help cool you down". As a seven-year-old, this seemed like a crazy idea, especially ...

Jul 27, 2016
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'Heat dome' not budging until week's end

(HealthDay)—The massive "heat dome" that has blanketed the eastern United States with oppressive heat and humidity for days will not be budging before the end of the week, weather forecasters said Tuesday.

Jul 26, 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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