0
Why do the latent heat does not rise the temperature of the substance?
Wiki User
∙ 8y agoWant this question answered?
Be notified when an answer is posted
Add your answer:
Earn +20 pts
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 greater the specific heat, the lower the temperature rise. The specific heats will be listed in the Handbook of Physics and Chemistry.
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 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)
Water has a high latent heat capacity This means that?
They require alot more heat before their temperature start to rise, while others require less. These latter materials then takes much longer to cool down because they have more heat energy to give off.
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.
Why does temperature remains constant during the process of melting or boiling?
This is because the heat supplied to the substance is used up in the overcoming the inter molecular forces and therefore , it does not show up as a rise in the temperature. Temperature stays constant until all the interactions are broken.
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
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
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.
What does the latent heat of fusion represent?
The energy required to melt a substance. (Apex)
How does temperature vary when a substance changes from solid to liquid?
When heat is applied to a solid, its temperature rises until it reaches the melting point of the substance. As the heat application continues, the temperature remains constant at the melting point as all of the heat is consumed in changing the state of the substance from solid to liquid. It is only after the conversion to liquid is complete that the temperature of the substance again starts to rise as long as heat is still being applied.
What requires to rise 1 g of a substance 1°?
The specific heat is the amount of heat required to raise the temperature of 1 g of substance by one degree Celsius or one Kelvin.
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 greater the specific heat, the lower the temperature rise. The specific heats will be listed in the Handbook of Physics and Chemistry.
Why does your temperature gauge rise and lower only when you have the heat on?
Why does your temperature gauge rise and lower only when you have the heat on?
