# What is Heat absorbed: Definition and 16 Discussions

Latent heat (also known as latent energy or heat of transformation) is energy released or absorbed, by a body or a thermodynamic system, during a constant-temperature process — usually a first-order phase transition.
Latent heat can be understood as energy in hidden form which is supplied or extracted to change the state of a substance without changing its temperature. Examples are latent heat of fusion and latent heat of vaporization involved in phase changes, i.e. a substance condensing or vaporizing at a specified temperature and pressure.The term was introduced around 1762 by British chemist Joseph Black. It is derived from the Latin latere (to lie hidden). Black used the term in the context of calorimetry where a heat transfer caused a volume change in a body while its temperature was constant.
In contrast to latent heat, sensible heat is energy transferred as heat, with a resultant temperature change in a body.

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1. ### Thermodynamic Cycle -- Work done as a function of Heat absorbed

During a thermodynamic cycle, an ideal thermal machine absorbs heat Q2 > 0 from a hot source and uses it to perform Work W > 0, giving a cold source a heat Q1 < 0 with an efficiency of 20% . How much is the work done as a function of Q1 ?I have 2 question regarding this problem: 1) Why is Q1 the...
2. ### HVAC Attic to Pool Heat Exchange, will car radiator collect heat?

My attic gets very hot even with the exhaust fan I installed. I would like to move than heat to my swimming pool. I currently have a FAFCO solar pool heater where the pool pump pumps water up onto my roof and thru the 12' long solar panel and down back into the pool. I would like to free up roof...
3. ### Heat Absorbed by Gas: An Expert Explanation

Dear Experts, While going through the explanation why heat absorbed by a gas is path dependent, there were two examples of comparison. 1. A gaseous volume of 2 liters expanding slowly to 4 liters , supplying heat from a heater keeping the temperature of the gas constant at 300K. 2. A gas allowed...
4. ### How would I calculate how close a ship can approach the sun?

Homework Statement It's not a piece of homework, I'm doing a project and I've been wondering how I may be able to show it mathematically. I've covered the material before but it was a long long time ago... Homework EquationsThe Attempt at a Solution [/B] A-Thinking about modelling my "ship"...
5. Z

### Reversible Isothermal Expansion Steam

Homework Statement 2kgs (total mass) of steam goes through a revesible isothermal expansion at 500 degrees celcius. During the expansion the pressure drops from 300 kpa to 200 kpa. What is the heat absorbed by the steam during this process? Homework Equations U=W and W=nrt ln(v2/v1) The...
6. ### Heat absorbed by an ideal gas in a cycle

Homework Statement Homework Equations and the attempt at a solution:[/B] AC is adiabatic and AB is isothermal. Heat absorbed during process AC = 0 (adiabatic). Heat absorbed during process CB = C_p \triangle T=-\frac{\gamma}{\gamma -1} (P_2V_3 - P_2V_2) Heat absorbed during process BA =...
7. ### How Does Expanding an Ideal Gas Affect Heat Absorption and Internal Energy?

Homework Statement An ideal gas(γ=1.4) was expanded under constant pressure. The work done was 80 Joule.Calculate the heat absorbed and increase in internal energy of the system.
8. ### Calculating Heat Absorbed & Temperature Change of Rocks

Homework Statement Large beds of rock are used in some solar-heated homes to store heat. Assume that the specific heat of the rocks is 0.82 J/g-K. (a) Calculate the quantity of heat absorbed by 50.0 kg of rocks if their temperature increases by 12.0°C. (b) What temperature change would these...
9. ### Is heat absorbed, when volume is increased?

Homework Statement Hi! Greetings! This is not really a problem set; I just made the question up to better understand PV diagrams of Carnot cycle. Suppose you have a gas in a container with a movable piston, but is thermally insulated. If the volume of the gas increases, is heat absorbed by...
10. ### Calculating Heat Absorbed & Estimating Power Rating of Electric Heater

the question states exactly: Air passes over an electric heater at a steady rate of 2500 cubic centimeters per second. the steady inlet flow temperature of the air is 20 degree celcius and the steady outlet temperature is 40 degree celcius. part a. what is the heat absorbed by the air...
11. ### Heat Absorbed during a process on an Ideal Gas

Homework Statement 0.21 x 10-3 kmol of ideal gas occupy a volume of 5.0 x 10-3 m3 initially at a pressure of 1.2 x 105 Pa and temperature T. The volume of the gas is first decreased to 2.0 x10-3 m3 at a constant pressure of 1.2 x 105 Pa, and then the pressure is increased to 3.0 x105 Pa...
12. ### How can i calculate the exact amount of heat absorbed by a black paint?

Homework Statement Hi. Knowing the LRV, heat source and all other relevant details, how can we deduce the exact temp rise with black colour (or any other colour for that matter)?? The Attempt at a Solution i think just like we do for metals, if we know the heat absorption coefficient...
13. ### How can i calculate the exact amount of heat absorbed by a black paint

Hi. Knowing the LRV, heat source and all other relevant details, how can we deduce the exact temp rise with black colour (or any other colour for that matter)??
14. ### Quantity of heat absorbed or released

Homework Statement Calculate the quantity of heat absorbed (+) or released (-) during each of these changes: A. 250g. of water (about 1 cup)is heated from 15 degrees centigrade to 100 degrees; B. 500g. of water is cooled from 95 degrees centigrade to 55 degrees; C. 5.0ml. of water at 4...
15. ### Thermodynamics-Net heat absorbed?

Can someone define what net heat absorbed is. I'm taking physics 1 right now, and am not sure exactly what it is. We just learned the first law of thermodynamics, and one of the questions on the homework is asking us to find the net heat absorbed in an isometric process. I just have no idea what...
16. ### Change in energy = the heat absorbed by the calorimeter and the water?

I think the answer is d). Am i correct? Because the change in energy equals the heat absorbed by the calorimeter and the water. If not, can you please provide an explanation for your answer. Thanks