This process of exchange of heat is known as conduction. For example, a metal spoon placed in a hot coffee mug shows flow of heat from coffee to the spoon. Thus, we can conclude that a condition which must exist in order for conduction to occur between two substances is that the objects must be touching each other.
Which condition must exist in order for conduction to occur?
The law of conservation of energy states that energy cannot be or destroyed. Which condition must exist in order for conduction to occur between two substances? The molecules of the substances must be touching. Both substances must be the same temperature.
What is the condition for conduction mode?
the two bodies must be in physical contact. b. there must be temperature gradient between the bodies.
What are the two necessary conditions for conduction?
(i) The two objects should be in direct contact with each other. (ii) The temperature of the two objects should be different. Heat will flow only from a hotter object to a cooler object.
What happens in order for conduction to take place?
Conduction occurs when a substance is heated, particles will gain more energy, and vibrate more. These molecules then bump into nearby particles and transfer some of their energy to them. This then continues and passes the energy from the hot end down to the colder end of the substance.
Which best explains Alex’s error?
Alex studied the image shown. He concluded that the image shows thermal energy being transferred from the flames to the person’s hands through conduction. Which best explains Alex’s error? The image does not show conduction because the molecules of two substances or objects are not in direct contact.
What is needed for convection?
Convection occurs when particles with a lot of heat energy in a liquid or gas move and take the place of particles with less heat energy. … The liquid or gas in hot areas is less dense than the liquid or gas in cold areas, so it rises into the cold areas. The denser cold liquid or gas falls into the warm areas.
Which mode is more dominant in heat conduction?
Convection is usually the dominant form of heat transfer in liquids and gases. Although sometimes discussed as a third method of heat transfer, convection is usually used to describe the combined effects of heat conduction within the fluid (diffusion) and heat transference by bulk fluid flow streaming.
What is the condition for conduction mode of heat transfer?
Conduction is the method of transfer of heat within a body or from one body to the other due to the transfer of heat by molecules vibrating at their mean positions. The bodies through which the heat transfer must be in contact with each other.
What is the conduction for conduction mode of heat transfer between two bodies?
1 Conduction Heat Transfer. Conduction heat transfer is the transfer of heat by means of molecular excitement within a material without bulk motion of the matter. Conduction heat transfer in gases and liquids is due to the collisions and diffusion of the molecules during their random motion.
What is the difference between conduction and convection?
In conduction, heat transfer takes place between objects by direct contact. In convection, the heat transfer takes within the fluid. In radiation, heat transfer occurs through electromagnetic waves without involving particles. The heat transfer takes place due to the difference in temperature.
Which two conditions must be satisfied for heat transfer by conduction?
The two conditions that must be satisfied for heat transfer by conduction is that two object must have different temperature. Heat always flow or move from the hotter object to the cooler one.
What is called convection?
1 : the action or process of conveying. 2a : movement in a gas or liquid in which the warmer parts move up and the cooler parts move down convection currents. b : the transfer of heat by convection foods cooked by convection ” compare conduction, radiation.
What is a real life example of conduction?
A common example of conduction is the process of heating a pan on a stove. The heat from the burner transfers directly to the surface of the pan.
What are the 4 types of heat transfer?
Various heat transfer mechanisms exist, including convection, conduction, thermal radiation, and evaporative cooling.
What direction is heat transferred in the situation?
And unless people interfere, thermal energy ” or heat ” naturally flows in one direction only: from hot toward cold. Heat moves naturally by any of three means. The processes are known as conduction, convection and radiation.