Related topics: electricity

NASA Moon rocket ready for second attempt at liftoff

After technical issues halted its first launch attempt, NASA will try again on Saturday to get its new 30-story rocket off the ground and send its unmanned test capsule towards the Moon.

Planetary-scale 'heat wave' discovered in Jupiter's atmosphere

An unexpected "heat wave" of 700 degrees Celsius, extending 130,000 kilometers (10 Earth diameters) in Jupiter's atmosphere, has been discovered. James O'Donoghue, of the Japanese Aerospace Exploration Agency (JAXA), has ...

NASA's Moon mission pushed back, again

NASA is now targeting September 27 as the earliest possible launch date for its uncrewed Artemis 1 mission to the Moon, the agency said in a blog post Monday.

Californians asked to conserve power amid brutal heat wave

Californians sweltering in the West's lengthening heat wave were asked to reduce air conditioning and cut other electricity use again during critical hours Friday and again Saturday to prevent stress on the state's electrical ...

Japan braces for 'very dangerous' Typhoon Nanmadol

Japan's weather agency warned Saturday of "unprecedented" risks from a "very dangerous" typhoon heading towards the southern Kyushu island, urging residents to take shelter ahead of the storm.

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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.

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