In other words, you can’t get down to absolute zero at all. Each step in the process of lowering an object’s temperature to absolute zero can get the temperature a little closer, but you can’t get all the way there. S – S° = S – 0 = 0 S = 0 ( Holzner, n.d.) S S 0 0 (Imgur, n.d.)
Three Methods of Heat Transfer This image gives us an insight into the three different methods of heat transfer. The fire heats the pot through radiation, the water boils inside the pot through convection and the pot handle becomes hot through conduction. ( Physics Classroom, n.d.) (CDN, n.d.)
Radiation “Radiation is the transfer of heat by means of electromagnetic waves. To radiate means to send out or spread from a central location. Whether it is light, sound, waves, rays, flower petals, wheel spokes or pain, if something radiates then it protrudes or spreads outward from an origin.” ( Physics Classroom, n.d.) All objects radiate energy in the form of electromagnetic waves. The rate at which this energy is released is proportional to the Kelvin temperature (T) raised to the fourth power. The hotter the object, the more it radiates. ( Physics Classroom, n.d.) Radiation rate = k•T4 Elmo absorbs the radiant energy of a jet engine. As such, Elmo radiates energy onto the pole, creating conduction energy. (PinImg, n.d.)
Conduction “The mechanism in which heat is transferred from one object to another object through particle collisions is known as conduction. In conduction, there is no net transfer of physical stuff between the objects.” ( Physics Classroom, n.d.) The branding iron conducts heat to wood, thus branding the wood. Q= kA(T Hot - T Cold ) t d T 1 ( H o t ) T2 (Cold) (Sonder Agency, 2016)
Convection “Convection is the process of heat transfer from one location to the next by the movement of fluids. The moving fluid carries energy with it. The fluid flows from a high temperature location to a low temperature location.” ( Physics Classroom, n.d.) The metal pot that holds the water is heated by the stove. As the metal becomes hot, it begins to heat the water within the pot. Q= HcA(T Hot - T Cold ) T1 (Hot) T2 (Cold) (Wiki Media, n.d.) (PNG Img, n.d.)
Contrast Conduction involves heat transfer through solids Convection involves heat transfer through liquids and gases Radiation involves heat transfer through electromagnetic waves (Hyper Physics, n.d.) (Miltons Smooth Co, 2015) (CLKER, n.d.)
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