internal heat

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• Internal heat — is the heat source from the interior celestial objects, such as planets, brown dwarfs, and stars, caused by gravity and decaying radioactive materials. The amount of internal heat depends on mass; the more massive the object, the more internal… …   Wikipedia

• Heat equation — The heat equation is an important partial differential equation which describes the distribution of heat (or variation in temperature) in a given region over time. For a function of three spatial variables ( x , y , z ) and one time variable t ,… …   Wikipedia

• Heat-based contraception — An experimental male contraceptive method involves heating the testicles so that they cannot produce sperm. Sperm are best produced at a temperature slightly below body temperature. The muscles around a man s scrotum involuntarily tighten if the… …   Wikipedia

• Heat balance —   The outdoor temperature at which a building s internal heat gain (from people, lights and machines) is equal to the heat loss through windows, roof and walls.   California Energy Comission. Dictionary of Energy Terms …   Energy terms

• Heat transfer — is a discipline of thermal engineering that concerns the exchange of thermal energy from one physical system to another. Heat transfer is classified into various mechanisms, such as heat conduction, convection, thermal radiation, and phase change …   Wikipedia

• Internal ballistics — Internal ballistics, a subfield of ballistics, is the study of a projectile s behavior from the time its propellant s igniter is initiated until it exits the gun barrel. The study of internal ballistics is important to designers and users of… …   Wikipedia

• Heat recovery ventilation — (also known as a heat exchanger, air exchanger or air to air exchanger) is a ventilation system that employs a counter flow heat exchanger between the inbound and outbound air flow. HRV provide fresh air and improved climate control, while also… …   Wikipedia

• Internal-combustion engine — Internal combustion engine) in which the heat or pressure energy necessary to produce motion is developed in the engine cylinder, as by the explosion of a gas, and not in a separate chamber, as in a steam engine boiler. The gas used may be a… …   The Collaborative International Dictionary of English

• Internal conversion (chemistry) — Internal conversion is a transition in from a higher to a lower electronic state in a molecule. It is sometimes called radiationless de excitation , because no photons are emitted. It differs from intersystem crossing in that, while both are… …   Wikipedia

• Heat and smoke vent — Heat and Smoke Vents are installed in buildings as an active fire protection measure. They are openings in the roof which are intended to vent the heat and smoke developed by a fire inside the building by the action of buoyancy, such that they… …   Wikipedia

• Heat syndrome — is a rare condition that, historically, has been so difficult to categorize, that it has been considered either a rare symptom of another condition, or merely fictional. A fictional character in the novels Vampire Hunter D frequently suffered… …   Wikipedia