Heat and Temperature Essay

Sensible heat is the heat acquired by transfer from an object of higher temperature. These various types of heat energy can be transferred in different forms such as conduction, convection and radiation. Conduction is the transfer of heat from one molecule to another within a substance. How fast this heat moves depends on the whether the material is a good conductor or not. Air is a poor conductor of heat so any form of heat transfer using conduction it is done near the earth’s surface.

At this point, one object does not contain a higher temperature than the other, so the heat transfer ends. The rate at which the heat is transferred depends on the composition of the material that separates the two temperatures. For example, the rate at which heat flows from hot water to cold water through a copper cup will be different than if the cup is porcelain. The rate that the heat energy is transferred is directly proportionate to the rate at which the temperature changes. Also, since the lower temperature is gaining ... ... middle of paper ... ...make the equations work and come up with an appropriate answer.

The energy is transferred from one particle to another very quickly. Soon particles from far away have more and more kinetic energy, heating the material. A good conductor is metal. In convection, particles in a fluid moves all the time. When you heat a fluid, energy is transferred to the particles.

Heat spreads through out an object till the object is the same all the way around. (Physical Science section 6.1, page 1) This happens because all particles vibrate unless in an absolute zero situation. These more violently moving particles hit each other. Eventually these particles will vibrate at the same speed. Conduction takes place in all the states of matter.

THERMOELECTRIC COOLING In thermoelectric cooling Peltier’s effect is used to cause heat flux between the junctions of different types of materials. A Peltier heater/cooler transfers heat from one side of the device to the other by consuming electrical energy. This device is also known as a Peltier device, Peltier heat pump, solid state refrigerator, or thermoelectric cooler (TEC). Since there are more economical and easy ways of achieving cooling, Peltier’s devices are mostly used for cooling purposes. However, since a single device can be used for both heating and cooling, the desirability of Peltier’s device is more.

It is then absorbed by them, furthermore, increasing kinetic energy and temperature. An example of this would be the sun heating the earth. There is no contact between the two objects. Heat “radiates” from the origin (the sun) and spreads to it’s surroundings (Earth). However, this is not the only example of radiation heat transfer.

"Temperature." UXL Encyclopedia of Science. U*X*L, 2007. Science in Context. Web.

Conduction, convection and radiation are the three methods through which heat can be transferred from one place to another. The (www.hyperphysics.com) first method is the conduction through which heat can be transferred from one object to another object. This process is defined as the heat is transmitted from one to another by the interaction of the atoms and the molecules. The atoms and the molecules of the body are physically attached to each other and one part of the body is at higher temperature to the other part or the body, the heat begins to transfer. A simple experiment through which conduction can be understood easily is as follows.

But experience indicates that only certain states occur. This leads to the second law of thermodynamics and contrast between another state variable called entropy. The second law stipulates that the total entropy of a system plus its environment can not decrease; it can remain constant for a reversible process but must always increase for an irreversible process. Thermal energy is the energy a substance or system has due to its temperature, i.e., the energy of moving or vibrating molecule. Thermodynamics involves measuring this energy, which can "exceedingly complicated," according to David McKee, a professor of physics at Missouri Southern State University.

Understanding Thermodynamics Through the Concepts of Absolute Zero and the Distribution of Molecular Speeds Thermodynamics is the study of work, heat, and the energy of a system (NASA, 2010). To help explain in more detail the properties of thermodynamics are the laws of thermodynamics. The first law explains that a system’s internal energy can be increased by adding energy to the system or by doing work on the system (Serway & Vuille, 2012). An internal energy system is the sum of both its kinetic and potential energies. The first law more simply states that the change in internal energy of a system is caused by an exchange of energy across the system, typically in the form of heat, or by doing work on the system.