what process creates the heat generated by WARM BLOODED creatures like humans that does not occur in cold bloo
110876
Reptiles and many other animals, particularly most insects live at the temperature of the world around them - cold when it is cold and hot when it is hot - this is called poikilothermy, or being poikilothermic. Endothermy means generating heat internally. All mammals are endothermic and most are homeothermic. \n\nWe maintain our inner temperature by burning food (oxidation) within ourselves and we stay cool by sweating, panting and changing our postures and place in the world. Sweating and panting work by generating heat loss through evaporating water; changing posture allows us to control to some extent the heat absorbed from the world around us; while changing position simply means seeking shade or shelter when it is too hot. Mammals are unique in possessing hair and in many mammals hair varies throughout the year. these mammals possess a thick insulating coat of hair during winter and a much thinner one during summer.\n\nBeing warm blooded gives mammals a distinct advantage in may habitats, allowing them to be active when reptiles are hardly able to move. It also allows mammals to live in habitats where reptiles cannot live at all, such as the arctic, mountain tops, etc. The reason behind this is that muscle activity is basically dependent on chemical reactions, as are all biological functions. Chemical reactions run slowly when it is cold, but quickly when it is hot. This is because heat is synonymous with (the same as) energy. The more energy you have the faster the chemical reaction occurs. In the early mammals being endothermic probably allowed them to be active at night when competing reptiles were forced to rest or be sluggish.\n\nBeing warm blooded is costly. Mammals and bird have mush greater energy requirements than reptiles of a similar weight.
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Actually   they are quite warm,  They usually build a fire with a hole in the top of the igloo for the smoke
918513
Heat transfer in the Earth's atmosphere is dominated by radiation effects, rather than thermal conduction or convection.\n\nIt's complicated, but on average the Earth's surface is a few tens of degrees warmer than the surface of the Moon, which receives the same amount of sunlight, and of course has no atmosphere.
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the body is not very good at changing energy into movement\n3/4 of the energy used to move muscles is turned into heat instead of moving the muscle\nthis heat is what makes you warm
159463
Thermal energy is heat that comes in 3 forms: conduction, convection, and radiation.  Conduction is when you are cooking on a stove and the heat passes through the metal in the burner and into the pan.  Convection is when air passes over a warm surface and rises or moves because of the increase in energy and takes the thermal energy with it.  Radiation is how the Sun brings energy to the Earth and other planets.  Thermal energy is measured in Joules (J for short) or British Thermal Units (BTUs).  The transfer of heat is measured in Joules per second, or watts, and BTU/hour.\n\nIts use is almost every aspect of our lives, from your body keeping itself warm to cooking to keeping your house warm to chemical reactions that generate heat.  If you want to study thermal energy, you might major in Mechanical Engineering or Physics in college.  I have a degree in Mechanical Engineering.
1160653
Space near the earth is actually filled with a gas called the interplanetary medium (see first source). This gas, which is mostly gas coming from the sun, is quite hot, around 100,000 degrees C. But, it's also only 10^-18th the density of sea level air, so it carries very little heat.\n\nAir is relatively thick, so we're used to conduction and convection determining an objects temperature.  There's very little of either in space, so radiation dominates.  The sun's light is about twice as strong in space as it is on earth.  How hot this heats an object depends on the objects shape and color, but it's fair to say that most things will heat up to a few hundred degrees. \n\nBecause there's no air in space, everything looses heat very slowly, like being in a thermos. So, anything that produces heat, like a human body or machinery, will gradually warm up--space suits have built-in coolers to deal with this. \n\nIf you're out of the sunlight and have used up all your internal energy, you eventually cool down to about -25 to +25 C.  Infrared radiation from the earth is what prevents you from getting colder.  If you were also far away from the earth, you'd cool down to something between -240C and -270C.
97497
There are temperature changes is most reactions becuase there is heat generated, known as the heat of reaction.
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live human is "hot" because of all the 4 processes needed for the body to be alive.\nthe process generate heat as a by product of the reactions occurring .\n\nWhen animals are dead there are no more metabolic reactions to generate the heat so the temperature decreases.
275009
When two people kiss one will be warmer than the other.  Due to the laws of thermodynamics the warmer of the two will transfer thermal energy to the cooler of the two.  Therefore the secret energy transferred by a kiss is thermal energy.
354239
If you are talking about heat energy then it's called an exothermic reaction.\n\nEndothermic reactions are the ones that absorb heat (i.e. they seem to cool things)
607531
Heat flows through three mechanisms:\n\n(1) Conduction --- This is what happens when you hold a piece of metal with the other end in a flame. The heat is conducted to your fingertips.\n\n(2) Convection --- This is what happens when you turn the furnace on in the morning. The warm air coming from the outlet mixes with the rest of the air in the room and you feel the heat.\n\n(3) Radiation --- This happens when you step out into the sunlight or under a heat lamp. The radiated heat is the same thing as visible light. It is just a longer wavelength. \n\nThe earth receives radiation from the sun. There is also a small amount of heat carried up from the core where nuclear fission still takes place. This is conducted by both convection (magma) and conduction. There is also a minute amount of heat from fires etc. But most of earth's heat comes from the sun.\n\nThe earth surface loses some heat to the atmosphere (you should be able to figure out which of the three is taking place here). But the biggest loss is radiating heat out into space. The greater heat flow will be from the warmer object to the cooler object. Since space is only a few degrees above absolute zero (search for: "absolute zero" kelvin) the earth loses heat to space.\n\nYou can easily see this on a cool night. Your car will conduct heat to anything contacting it. Heat from the inner parts of the car will conduct to the outer skin of the car. There it will warm the air slightly. The air will carry the heat off through convection. This will continue until the car and the air are the same temperature.\n\nBut, the car is also exposed to space and will continue to radiate heat to space, even after it is colder than the surrounding air. As a result, dew will start to form on the cold car surfaces. If the car is parked under a car, it is not exposed to space. It will not radiate heat off into space. It will still radiate heat, but it will also receive heat back from the tree, which is also radiating. So the car will not cool down far enough to form dew.\n\nIf you are interested in space in general and the moon in particular, try:\nhttp://groups.yahoo.com/group/lunar-observing/\n\nClear Skies\n\nChuck Taylor
94711
The real answer is that waterbirds have a really clever method of stoping the cold blood from their feet mixing with the blood from their bodies, and vice versa. \n\nAs blood flows into the feet it passes right beside the blood flowing out. Most of  the heat is drawn from the warm blood before it reaches the feet, but enough heat remains to prevent the feet from freezing.  \n\nThe blood then leaves the feet, passing close to fresh blood coming in. The cold blood draws the heat form the warm blood, and thus warms up before it enters the body again.  That prevents the duck form getting cold even though its feet are just a few degrees above freezing.\n\nThis system is most well developed in the penguins, some of which spend months at a time standing on ice.  If the solution was simply that the feet contained no nerves or blood vessels the penguins may not feel cold,  but there feet would freeze solid and shatter into a million pieces as soon as they tried to move them.\n\n_____________________________\n>>>>Ducks' feet have no nerves or blood vessels. \n\nThis is just nonsense of course. If a ducks feet have no blood vessels then how exactly do you think they supply oxygen to the cells?
214023
snail being a mammal is warm blooded
524471
Warm-blooded animals maintain thermal homeostasis; that is, they keep their core body temperature at a nearly constant level regardless of the temperature of the surrounding environment. This can involve not only the ability to generate heat, but also the ability to cool down. Warm-blooded animals control their body temperature by regulating their metabolic rates (e.g. increasing their metabolic rate as the surrounding temperature begins to decrease).\n\nBoth the terms "warm-blooded" and "cold-blooded" have fallen out of favor with scientists, because of the generality of the terms, and due to an increased understanding in this field. Body temperature types do not fall into simple either/or categories. Each term may be replaced with one or more variants (see: breaking down warm-bloodedness). Body temperature maintenance incorporates a wide range of different techniques that result in a body temperature continuum, with the traditional ideals of warm-blooded and cold-blooded being at opposite ends of the spectrum.\n\nBreaking down warm-bloodedness\nWarm-bloodedness generally refers to three separate aspects of thermoregulation.\n\nEndothermy is the ability of some creatures to control their body temperatures through internal means such as muscle shivering, fat burning, and panting (Greek: endo = "within," therm = "heat"). \nHomeothermy is the kind of thermoregulation used by those creatures that maintain a stable internal body temperature regardless of external influence. This temperature is often higher than the immediate environment (Greek: homoios = "same, identical," therm = "heat"). \nTachymetabolism is the kind of thermoregulation used by creatures that maintain a high resting metabolism (Greek: tachy = "fast, swift," metabol = "to change"). Tachymetabolic creatures are, essentially, "on" all the time. Though their resting metabolism is still many times slower than their active metabolism, the difference is often not as large as that seen in bradymetabolic creatures. Tachymetabolic creatures have a harder time dealing with a scarcity of food.
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Human beings lack body hair for a simple reason - we have the most efficient heat dissipation system of any mammal in the world! Human sweating is extremely efficient, since without hairs to trap the sweat on the body, the massive pouring of fluids through the skin's pores works not entirely like car air-conditioning. Humans can sweat more fluid per hour than any other mammal.\n\nHumans are amazing endurance runners. In a recent issue of Discover, the author noted that human beings can outrun any animal on Earth, if the pursuit lasts long enough - humans in good condition do not need to stop and take breaks because our heat dissipation system keeps our body temperature stabler than any other creature's. The ability to "run down" anything gave early humans an amazing survival advantage.\n\nThese adaptations appear to have appeared in Homo Erectus, about a million and a half years ago. Scientists were able to determine this timeline because of the amount of genetic divergence between the two living human species of body lice. Also, Homo Erectus is the first human to develop the skeleton of a fully modern and athletic bipedal human.
174163
thermodynamics?  heat transfer?  physics?
791209
Creation of fire\nFire is simply glowing gas and other combustion materials such as carbon particles. It is not plasma, as it is not hot enough to reach such high ionization as is required of plasma (an 'electrically neutral, highly ionized gas composed of ions, electrons, and neutral particles').\n\nThis state of matter can be generated through focused concentrations of energy (such as fuel being exposed to an already open flame or to the Sun's rays focused through a lens), or through an exothermic chemical reaction usually accompanied by intense heat released during a rapid oxidation of combustible material(striking a match). Fire may be visible as a brilliant glow and/or flames and may produce smoke.\n\nFires start when a flammable or combustible material with an adequate supply of oxygen or another oxidizer is subjected to enough heat. The common fire-causing sources of heat include a spark, another fire (such as an explosion, a fire in the oven or fireplace, or a lit match, lighter or cigarette) and sources of intense thermal radiation (such as sunlight, a flue, an incandescent light bulb or a radiant heater). Mechanical and electrical machinery may cause fire if combustible materials used on or located near the equipment are exposed to intense heat from Joule heating, friction or exhaust gas. Fires can sustain themselves by the further release of heat energy in the process of combustion and may propagate, provided there is a continuous supply of oxygen and fuel. Fires may become uncontrolled and cause great damage to and destruction of human life, animals, plants and property.\n\nFire is extinguished when any of the elements of the so-called fire triangle—heat, oxygen, or fuel— are removed. The unburnable solid remains of a combustible material left after a fire are called ash.\n\nFlames can conduct electricity, as a small portion of any fire is ionized. This has been demonstrated in the laboratory and also in large wildfires that occur in the vicinity of power lines. This ability to conduct electricity is due to its partially plasmatic nature.