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Science - 3 heat transfer methods
Science - 3 heat transfer methods
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Lab #7: Thermal Energy
Heat is thermal energy being transferred from one place to another, because of temperature changes. This can take place by three processes. These three processes are known as conduction, convection, and radiation.
When we place two objects with different temperatures in contact with each other, the heat from the hotter object will immediately and automatically flow to the colder object. This is known as conduction. Some objects make excellent conductors of heat while others make poor conductors of heat or excellent insulators. Silver, copper, and gold make excellent conductors of heat. Foams and plastics make good insulators of heat but make poor conductors. Last night for dinner, I made myself a grilled cheese sandwich and a bowl of tomato soup. I heated the soup faster than I cooked the sandwich so I poured the hot soup into a bowl and finished cooking the sandwich. Once I was done cooking, I gabbed the soup bowl and burned my hand. The heat from the soup made the bowl hot. This is an example of conduction.
The process of conduction between a solid surface and a moving liquid or gas is called convection. The motion of the fluid may be natural or forced. If a liquid or gas is heated, its mass per unit volume generally decreases. If the liquid or gas is in a gravitational field, the hotter, lighter fluid rises while the colder, heavier fluid sinks. For example, when water in a pan is heated from below on my stove, the liquid closest to the bottom expands and its density decreases. The hot water as a result rises to the top and some of the cooler fluid descends toward the bottom, thus setting up a circulatory motion. This is also why the heating of a room by a radiator depends less on radiation than on natural convection currents, the hot air rising upward along the wall and cooler air coming back to the radiator from the side of the bottom. Because of the tendencies of hot air to rise and of cool air to sink, radiators are positioned near the floor and air-conditioning outlets near the ceiling for maximum efficiency.
Radiation is fundamentally different from both conduction and convection in that the substances exchanging heat need not be in contact with each other. All substances emit radiant energy merely by virtue of having a positive absolute temperature.
In his “State of the Union” speech, President Barack Obama effectively uses the rhetorical devices of Ethos, Pathos and Logos to convey a more convincing message to the citizens of the United States to urge them to follow the example of the many people that have made their nation greater.
When there is a heat exchange between two objects, the object’s temperature will change. The rate at which this change will occur happens according to Newton’s Law of heating and cooling. This law states the rate of temperature change is directly proportional between the two objects. The data in this lab will exhibit that an object will stay in a state of temperature equilibrium, unless the object comes in contact with another object of a different temperature. Newton’s Law of Heat and Cooling can be understood by using this formula:
Convection is a transfer of internal energy into or out of an object by the physical movement of a surrounding fluid that transfers the internal energy along with its mass. According to Oxford Dictionary, convection is the movement caused within a fluid by the tendency of hotter and therefore less dense material to rise, and colder or denser material to sink under gravity's influence, that results in transfer of heat. Two fluids are liquid and gas.The fluid above a hot surface expands, becomes less dense, and rises.This applies to objects such as steam from a hot cup of coffee turning cool, ice melting like heat moving to ice from the air, or frozen material becoming raw like how frozen food thaws more quickly under cold running water. When
The thirty-fifth President, John Fitzgerald Kennedy, in his Inaugural Address, optimizes being inducted into office in order to tell the people of the United States to enact on reuniting the nations together as one. Kennedy appeals to ethics and morals of the audience and himself by implying that change will not happen soon, but if our nation stays tenacious we could see a world at peace. The 1960’s was an inefficacious time with the Cold War at its height, fear of nuclear warfare, and the coercing of communism. Kennedy expounds a candid and tolerant tone to urge the people of the United States and others around the world who will hear his message to join in on the movement for world peace throughout nations.
John F. Kennedy’s inaugural address is arguably one of the most powerful speeches in American history; He calls the American people to action against violence for the sake of peace and preservation of freedom. Elected during the Cold War, Kennedy reinvigorated the American people with his patriotic attitude. The address inspires the American people to fight for liberty and peace during this time of war. His idealistic tone resonates with the American people, and his powerful diction brings importance to his goal of world peace. Kennedy’s inaugural address combines formal, abstract diction, varied sentence structure, and parallelism to create a patriotic and idealistic tone that supports
good emitter of heat radiation so a lot of heat will be lost to the
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. First of all, take a metallic rod of any length. Hold the rod in the hand or at any stand made up of the insulator so that the heat does not transfer to the stand. Heat up the one end of the rod with the help of the spirit lamp. After sometime, touch the other end of the end, the other end of the becomes heated too and the temperature of the other end of the rod has also increased. Although only one end of the rod is heated with the spirit lamp, but the other end of the rod has also been heated. This is represents that the heat has been transferred from one end of the rod to the other end of the rod without heating it from the other end. So, the transformation of the heat is taking place. This process is called the conduction. Conduction is a process which is lead by the free electrons. As the conduction happens occurs only in the metallic materials, the reason for it is that the metals has the free electrons and they can move freely from one part of the body to another part of the body. These electrons are not bounded by the nucleus so, they can move ea...
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. First of all, take a metallic rod of any length. Hold the rod in the hand or at any stand made up of the insulator so that the heat does not transfer to the stand. Heat up the one end of the rod with the help of the spirit lamp. After sometime, touch the other end of the end, the other end of the becomes heated too and the temperature of the other end of the rod has also increased. Although only one end of the rod is heated with the spirit lamp, but the other end of the rod has also been heated. This is represents that the heat has been transferred from one end of the rod to the other end of the rod without heating it from the other end. So, the transformation of the heat is taking place. This process is called the conduction. Conduction is a process which is lead by the free electrons. As the conduction happens occurs only in the metallic materials, the reason for it is that the metals has the free electrons and they can move freely from one part of the body to another part of the body. These electrons are not bounded by the nucleus so, they can move easily. And when the temperature of the ...
Conduction, Convection, and Radiation Heat transfer is the way heat moves through matter to change the temperature of other objects. There are three types of heat transfers, Conduction, Convection, and Radiation. The first kind of heat transfer, conduction, is heat transferring through direct contact of materials. This would be the same thing as a pan on the stove. The heat from the stove touches the pan directly, therefore making the pan hot.
table. It is slightly denser than air. It is a poor conductor of heat and electricity, and
Before discussing the details of how light and heat are produced, the characteristics of sun should be kept in mind. The body of sun consists of hydrogen at high temperatures which can cause nuclear fusion. The process of fusion requires two atoms of hydrogen to fuse their nuclei and as a result significant amount of energy is released in the form of light and heat that travels all the way from sun to earth.
"Our stories are singular, but our destiny is shared, and a new dawn of American leadership is at hand."(EternalMedia, 2008) Those words are from Obama's aspiring, and emotional speech. Following the victory establishing trust and gathering all the factions of the citizens around the president was a necessity. In his home city Chicago Obama gave his victory speech that was a great sign to express his loyalty to his people and to the Americans as a metaphor. (240,000 pack Grant Park for election rally, 2008 ) Winning the election was the big event and the main reason
from the sun is absorbed by earth’s system, the earth can get warm. When suns energy is
Heat energy is transferred through three ways- conduction, convection and radiation. All three are able to transfer heat from one place to another based off of different principles however, are all three are connected by the physics of heat. Let’s start with heat- what exactly is heat? We can understand heat by knowing that “heat is a thermal energy that flows from the warmer areas to the cooler areas, and the thermal energy is the total of all kinetic energies within a given system.” (Soffar, 2015) Now, we can explore the means to which heat is transferred and how each of them occurs. Heat is transferred through conduction at the molecular level and in simple terms, the transfers occurs through physical contact. In conduction, “the substance
When there is a change in the magnetic field near a material which is electrically conductive, there will be a current produced in the material know as eddy current. This eddy current is responsible for the heating of the material. The amount of eddy currents produced in the conductor depends mainly on the external magnetic field. Heat generation can be controlled by the magnetic field as the heat generated in the element is directly proportional to the current which depends on the magnetic flux. So heat is indirectly controlled by the magnetic flux.