Table of Contents
Does the size of an object affect heat transfer?
Each individual particle on the surface of an object is involved in the heat conduction process. An object with a wider area has more surface particles working to conduct heat. As such, the rate of heat transfer is directly proportional to the surface area through which the heat is being conducted.
Can two objects have the same temperature but different amounts of heat?
Identical masses of different materials can have different amounts of thermal energy, even at the same temperature. This means that the material that makes up the substance is a third factor that affects how much thermal energy a substance has.
What happens when the two objects have the same temperature in a heat transfer?
If two objects at different temperatures are brought in contact with each other, energy is transferred from the hotter to the colder object until equilibrium is reached and the bodies reach thermal equilibrium (i.e., they are at the same temperature). Heat is a form of energy, whereas temperature is not.
Does heat transfer more quickly when there is a large temperature difference?
The larger the difference in temperature between two objects, the faster heat will transfer from the hotter one to the cooler one. The rate of heat transfer between two objects is proportional to the temperature gradient and to the amount of surface area through which the conduction occurs.
Does weight affect heat transfer?
Heat transfer is affected by both, molecular weight and pressure drop. Molecular weight affects the properties of the working fluid and adiabatic index ( Cp/Cv) which directly influence the heat transfer and consequently heat transfer coefficient.
Does heat cause objects to lose mass?
In fact, the vast majority of the mass of an atom is due to the internal energy between quarks that make up the nucleus rather than the rest mass of the quarks themselves. So, yes, a hot object has greater rest mass and would weigh more when measured, if a scale were sensitive enough.
Does hot weather make you gain weight?
In the summer, body weight can go up by several pounds due to increased body water. This is accomplished through fluid-conserving hormones such as aldosterone, which allows the kidney to retain more fluid and reduces the amount of salt in sweat, a measure that also aids in water retention.
How does the rate of heat transfer depend on the temperature?
The amount of heat leaving the hot object will be equal to the amount of heat received by the colder object (assuming nothing else is around to receive some of the heat). The rate (in W) at which heat transfers from the hotter object to the colder object increases with the temperature difference between the objects.
What causes heat to move from one point to another?
The movement of heat across the border of the system due to a difference in temperature between the system and its surroundings. Interestingly, the difference in temperature is said to be a ‘potential’ that causes the transfer of heat from one point to another. Besides, heat is also known as flux. How is Heat Transferred?
How is heat transferred from object to object?
Heat is transferred by one or more of three processes. Conduction, an example of which is having the objects in physical contact. Convection, in which the heat is transferred though a medium, such as air, so it’s a slower, much less efficient process.
How is heat transferred according to the first law of thermodynamics?
Heat transfer, and the first law of thermodynamics 6-24-98 Heat transfer There are three basic ways in which heat is transferred. In fluids, heat is often transferred by convection, in which the motion of the fluid itself carries heat from one place to another.