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How does the temperature of a substance change as it gains or loses heat?
A substance (in this case water) that gains or loses 'sensible' heat will change it's temperature at the rate of 1 deg F per pound of that substance per 1 btu loss or gain.That is to say that 1 pound of water will change 1 deg f as it loses or gains 1 btu of heat energy. That heat required to lose or gain 1 deg f is referred to as sensible heat, whether lost or gained, since it does change the temperature of the substance.However, that substance must gain or lose latent heat during a change of state; as in water changing from liquid to gas (steam). Latent heat affects the substance during it's change of state, and does not change the temperature of the substance during that change of state.Each substance has a specific heat, and so each substance has a different value of btu's required to make a change in their state or temperature.
Suppose a fixed number of joules of energy as heat is added to 1 kg of substances listed below. Which substance will the rise in temperature be the least?
The substance with the highest specific heat capacity will experience the smallest rise in temperature with the same amount of heat energy added. Water has the highest specific heat capacity among common substances, so it will experience the least rise in temperature when a fixed amount of energy is added.
What would increase a temperature of a substance?
An increase in energy input, such as heat transfer from a heat source or mechanical work, would increase the temperature of a substance. This causes the particles in the substance to move faster, leading to an increase in kinetic energy and temperature.
What is the difference between the latent heat of water and the latent heat of evaporation of water?
Latent heat means the inherent, hidden heat. When we place a vessel of water on a burning stove having a thermometer within, initially the temperature level would rise in the thermometer because heat is taken up by water from the stove. But when the temperature becomes nearly 100oC the temperature would remain at the same level. Do you say that heat is not taken by the water from the flame of the stove? Certainly not. Then why is it so? Here, a new phenomenon starts taking place. Every unit (say 1 kg) of water starts getting converted from liquid form into gas form, that is, steam. So heat is totally utilized for that change of state. Hence the level of the thermometer stands still. This amount of heat sole utilized to have this change of state is called latent heat of steam. This means all heat drawn from the stove is available as inherent heat within steam. When steam condenses back into water, the hidden heat would come out. Same way, you can think about giving heat to ice. If suppose the initial temperature of the ice is some -10oC, then temperature would rise up to 0oC and there after though heat is continuously passed on to the ice solid, the temperature will come to stand still. Now, the heat is used to melt every unit of ice into its liquid form (water). This heat is termed as latent heat of melting. Or even we say this as latent heat of fusion. The above two are the examples of the change of state. From liquid to gas and from solid to liquid. Apart from these, water would be changed into water vapour even at the room temperature. This phenomenon is due to the shooting off the water molecules right from the water medium into the atmosphere (air medium). But, you cannot see any fall in temperature due to this escape. Here molecules gain energy from the surroundings and hence molecules could come out so without making any change in its temperature. This is termed as latent heat of vapourisation. (this would be better instead evaporation)
Why doesn't the temperature of water continually increase as it heated?
Temperature doesn't give the whole picture when you talk about boiling. A more useful property to talk about is enthalpy. Enthalpy is the energy held by the water. Prior to the boiling point, enthalpy and temperature both rise linearly. At the boiling point, temperature stops rising, but enthalpy continues to rise until it becomes steam. If you were to continue adding energy to the steam, it's temperature would rise again. The amount of energy that must be added to water to get it from water just at the boiling point to steam is the latent heat of vaporization and is equal to the enthalpy rise discussed in the previous paragraph. The latent heat of vaporization and the temperature where boiling will occur are dependant on the pressure.
What is the difference in specefic heat and latent heat?
Specific heat is the heat energy in joules required to rise the temperature of one kg of substance through one kelvin without a change in its state. But latent heat is the heat required to change the state of one kg of substance without change in temperature.
What is laten heat?
"Latent heat" refers to the heat energy absorbed or released during a change of state without a change in temperature. For example, when ice melts into water, heat is absorbed from the surroundings without a rise in temperature, which is the latent heat of fusion. Similarly, when water vapor condenses into liquid water, heat is released without a decrease in temperature, known as the latent heat of condensation.
When water vapor condenses into a liquid does temperature rise?
Yes. There is latent heat release when vapor condenses.
What is the difference between latent heat and heat?
Usually as we give heat to a system then temperature of the system would rise. But at the boiling point though we give enormous amount of heat the temperature would remain the same and so the heat given is said to be latent and it is used to change water from liquid state to gaseous state. Hence the name latent heat
How does the temperature of a substance change as it gains or loses heat?
A substance (in this case water) that gains or loses 'sensible' heat will change it's temperature at the rate of 1 deg F per pound of that substance per 1 btu loss or gain.That is to say that 1 pound of water will change 1 deg f as it loses or gains 1 btu of heat energy. That heat required to lose or gain 1 deg f is referred to as sensible heat, whether lost or gained, since it does change the temperature of the substance.However, that substance must gain or lose latent heat during a change of state; as in water changing from liquid to gas (steam). Latent heat affects the substance during it's change of state, and does not change the temperature of the substance during that change of state.Each substance has a specific heat, and so each substance has a different value of btu's required to make a change in their state or temperature.
Why temperature does not rise even if water is heated as its boiling point?
In this first heat boil the water at its boiling point that is 100 degree Celsius, when the temperature is reached then heat supplied to water not boils the water it is used to change the state of the matter means heat is used to overcome the forces of attraction to change its state and the heat is latent heat of vaporisation.so this is latent heat (hidden heat) which not increase the temperature for some time.
Explain why the temperature of Wax remains constant during solidification?
it's because it releases the latent heat of fusion. Latent heat means energy is given out when a substance changes from liquid to solid without a change in temperature. and the transfer of energy doesnt change the KE of the particles, so the temperature remains unchanged. lanten heat gives rise to the change in PE of the particles during the change of state only
What does the latent heat of fusion represent?
The energy required to melt a substance. (Apex)
Suppose a fixed number of joules of energy as heat is added to 1 kg of substances listed below. Which substance will the rise in temperature be the least?
The substance with the highest specific heat capacity will experience the smallest rise in temperature with the same amount of heat energy added. Water has the highest specific heat capacity among common substances, so it will experience the least rise in temperature when a fixed amount of energy is added.
Why the temperature does not rise during the process of melting and boiling though the heat energy is constantly supplied?
During the process of melting and boiling, the heat energy supplied is being used to break the intermolecular forces holding the substance together. This energy is known as latent heat and does not result in a temperature increase because it is being used to change the state of the substance rather than raise its temperature. Once all the substance has melted or boiled, any additional heat energy supplied will then raise the temperature.
Will temperature rise if it's hot?
No, the temperature will not rise if it's already hot. Temperature is a measure of the intensity of heat present in a substance, so if it's already hot, the temperature will remain constant until there is a change in the heat input or output.
The temp of a substance increases as?
The temperature of a substance increases as heat energy is added to it, causing the particles in the substance to move faster, which leads to an increase in its kinetic energy. This increase in kinetic energy results in a rise in the average speed of the particles, leading to a rise in temperature.
