News tagged with energy

Related topics: electricity · energy consumption · renewable energy · energy efficiency · fossil fuels

New way to target the growth of breast cancer cells

An international team of researchers led from Karolinska Institutet and Science for Life Laboratory in Sweden have found a new way of halting the growth of breast cancer cells. In their study, which is published in Nature ...

Jan 18, 2018
popularity8 comments 0

Bile acids fire up fat burning

Obesity arises from an imbalance between energy intake and energy expenditure. As a result, current treatments try to decrease calorie intake and/or increase energy expenditure.

Jan 16, 2018
popularity1 comments 0

Is mixing drinks actually bad?

As we enjoy the festive season, many strongly-held beliefs about avoiding hangovers are thrown around. One is that mixing different types of drinks is likely to make you feel unwell during your drinking session and contribute ...

Dec 29, 2017
popularity6 comments 0

Energy

In physics, energy (from the Greek ἐνέργεια - energeia, "activity, operation", from ἐνεργός - energos, "active, working") is a scalar physical quantity that describes the amount of work that can be performed by a force, an attribute of objects and systems that is subject to a conservation law. Different forms of energy include kinetic, potential, thermal, gravitational, sound, light, elastic, and electromagnetic energy. The forms of energy are often named after a related force.

Any form of energy can be transformed into another form, but the total energy always remains the same. This principle, the conservation of energy, was first postulated in the early 19th century, and applies to any isolated system. According to Noether's theorem, the conservation of energy is a consequence of the fact that the laws of physics do not change over time.

Although the total energy of a system does not change with time, its value may depend on the frame of reference. For example, a seated passenger in a moving airplane has zero kinetic energy relative to the airplane, but non-zero kinetic energy relative to the Earth.

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

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