News tagged with heat

Related topics: electricity

Risk of heat-related health problems increases with age

With summer here and the temperatures rising, it is important to understand the health risks that excessive heat can bring and know the signs of heat-related illnesses. Older adults and people with chronic medical conditions ...

Jul 14, 2017
popularity4 comments 0

Extreme heat in southwest a deadly threat

(HealthDay)—With temperatures soaring so high that some planes couldn't take off in Phoenix on Tuesday, the heat wave scorching the Southwest for the next week should be taken very seriously, one emergency doctor warns.

Jun 21, 2017
popularity23 comments 0

Is it OK to run in heat of 30C or more?

Most of Britain is experiencing a heatwave, with temperatures reaching up to 32℃. The public health watchdog for England has issued an amber health warning, advising people to take care in the hotter weather. But what does ...

Jun 21, 2017
popularity0 comments 0

Stay safe as summer temps soar

(HealthDay)—As the first major heat wave of the season has much of the eastern United States sizzling, people need to take steps to prevent heat-related illnesses, an emergency doctor says.

Jun 13, 2017
popularity1 comments 0

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

Subscribe to rss feed