Which best describes the direction of heat?
Explanation: According to second law of thermodynamic, heat flows from higher to lower temperature region. Heat is the transfer of energy from an object at higher temperature to an object at a lower temperature. so energy flows from warmer to colder objects.
Which factors affect heat transfer between a warm and a cool substance?
The amount of time of contact, the area of contact, and the specific heals of the substances, the factors affect heat transfer between a warm and a cool substance. Explanation: Heat transfers from a very hot body always, and into a colder body.
What action increases heat transfer between two objects?
establishing their thermal equilibrium. increasing the area of their contact. using objects with similar specific heats. reducing the time of their contact.
Which method transfers heat from the sun to the ocean?
The transfer of heat energy within the atmosphere, hydrosphere, and the Earth’s surface and interior occurs as a result of radiation, convection, and conduction. Ocean currents play a significant role in transferring this heat toward the poles.
Which of these actions would decrease heat transfer between two objects?
Answer Expert Verified Answer: Reducing the time of contact between the two objects will decrease the heat transfer between them. Explanation: increasing the temperature of the warmer object will raise its own temperature and hence the heat transfer will increase.
Which best describes heat transfer by radiation?
Heat transfer by radiation occurs when microwaves, infrared radiation, visible light, or another form of electromagnetic radiation is emitted or absorbed. An obvious example is the warming of the Earth by the Sun. A less obvious example is thermal radiation from the human body.
Which indicates that thermal energy is no longer being transferred from boiling water to a mug?
Heat energy is absorbed by the substance. Which indicates that thermal energy is no longer being transferred from boiling water to a mug? The water and the mug are the same temperature.
What factor affects heat flow?
Factors that affect rate of heat flow include the conductivity of the material, temperature difference across the material, thickness of the material, and area of the material. Different materials have greater or lesser resistance to heat transfer, making them better insulators or better conductors.
What are the factors that affect the absorption of heat by an object?
The factors that affect the absorbance of heat by an object are:
- The specific heat capacity of the object to absorb and retain heat.
- The mass of the body directly affects the rate of its heat absorption.
- The temperature of the object, temperature rise will lead to increased heat absorption.
Does surface area affect heat loss?
There is a direct relationship that exists between surface area and heat loss in organisms. The larger the surface area, the greater the heat loss from the organism, and vice-versa.
What will affect the heat transfer rate in heat exchangers?
Abstract: Heat transfer performance of heat pipe heat exchanger affected by many factors, such as the opening temperature of the heat pipe, the rate of fluid-filled, the physical nature of liquid refrigerant, the work temperature of tube, angle, tube spacing, tube length, hot and cold fluid flow and wind speed.
What are heat Interchangers?
In the heat interchanger this cooling effect is used to subcool the liquir refrigerant entering the expansion valve. Increasing the degree of liquid subcooling as it enters the expansion valve. Heat interchanger application to compensate for elevation pressure loss in liquid line.
What type of heat transfer is involved in heat exchangers?
Chapter 8 – Heat Transfer and Heat Exchangers Heat exchangers are equipment for the transfer of heat between two fluids through a separating wall, and the three recognized modes of heat transfer are by conduction, convection, and radiation.
How does surface area affect heat transfer?
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.
Does shape affect heat transfer?
“The asymmetric shape enhances the heat transfer. The meniscus is where the highest evaporative heat transfer occurs, so we wanted to try to increase that region.” Previously, Agonafer developed a membrane with circular microscopic pillars designed to dissipate the heat in electronic devices.
Does size affect heat energy?
If two objects have the same mass, the object with the higher temperature has greater thermal energy. That’s because an object’s mass also affects its thermal energy.
Is heat transfer affected by volume?
Your ice cube will stay frozen forever, no heat is transferred, and neither volume nor surface play a role.
Does heat depend on the size of the object?
Heat is the flow of energy which changes the temperature of an object. So, a certain amount of heat can change the temperature of an object, but the size of the temperature change does not simply depend on the amount of heat; the size of the temperature change also depends on the identity of the object.
Does heat change mass?
All internal energy such as thermal, rotational, and internal potential energy contributes to the rest mass of an object. So, yes, a hot object has greater rest mass and would weigh more when measured, if a scale were sensitive enough.
Does heat effect mass?
In almost every chemistry and introductory physics textbook you’ll find the answer to this is that temperature has absolutely no effect on mass. Energy is just a different form of mass, and adding it to a closed system to increase the temperature will increase the mass of the system.