# What is specific heat really means

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 April 19, 2013, 00:27 What is specific heat really means #1 New Member   Sayee chandrasekara mouli Join Date: Mar 2012 Posts: 21 Rep Power: 5 I have confusion from my school days that why there is specific for everything..like specific heat,temp etc..pls help me with really meaning immortality likes this.

 April 19, 2013, 02:48 #2 Senior Member     Ehsan Join Date: Oct 2012 Location: Iran Posts: 2,186 Rep Power: 16 a wisely question. Well,i think maybe several reasons be in existence each different in different cases. I have not heard specific temperature(in real gas theory?) But in some cases we want only dimensionless numbers so that probably simplifies our work during calculation or make it easier when do experiments or compare related cases,like specific length that can be the ratio of two lengths. Or a quantity in a period of time or divided by a quantity of mass,like specific heat(J/kg.K). In some cases maybe we only want a name for a concept.as an example specific volume is only reciprocal of density. Want anyone contribute in this argument or my speech is complete? mouli1991 likes this.

 April 19, 2013, 05:09 Oh yeah..yes #3 New Member   Sayee chandrasekara mouli Join Date: Mar 2012 Posts: 21 Rep Power: 5 However I still cant understand...You said some used for concept sake..your example is j/kg k..and why do we need to do that...like specific volume.

 April 19, 2013, 06:22 #4 Senior Member     Philipp Join Date: Jun 2011 Location: Germany Posts: 1,097 Rep Power: 16 You can have an amount of heat Q stored inside a block of 2.3kg metal. Now, proportional to this heat Q is the heat capacity of the 2.3kg block C~Q. But this is just the heat capacity of a 2.3kg block. If you want to know the ability of that metal to store heat, you divide C by the mass of the block. Than you get the specific heat capacity. This is a material's property an not any longer the property of any special sized block. So if you are interested in material properties you need these "specific" values. I guess you can use this explanation for most of the "specific ..." cases. mouli1991 likes this. __________________ The skeleton ran out of shampoo in the shower.

 April 19, 2013, 07:42 #5 New Member   Sayee chandrasekara mouli Join Date: Mar 2012 Posts: 21 Rep Power: 5 Yes now explain specific volume.is the sa me concept as specific heat ..specific volume also material properties

 April 19, 2013, 07:49 #6 Senior Member     Philipp Join Date: Jun 2011 Location: Germany Posts: 1,097 Rep Power: 16 Sure... volume of a 0.1m cube of water is 1e-3m^3 or just 1 liter. The mass is about 1 kg. The materials property is volume per mass = specific volume. It's always the same value for water, whether you take any cube, sphere or whatever. __________________ The skeleton ran out of shampoo in the shower.

 April 19, 2013, 09:21 #7 New Member   Sayee chandrasekara mouli Join Date: Mar 2012 Posts: 21 Rep Power: 5 So to find the capacity of 1 cubic volume of liquid to store is specific volume...like ah ...heat storing capacity of a metal..volume/mass Am I got it correctly..

 April 19, 2013, 10:08 #8 Senior Member     Ehsan Join Date: Oct 2012 Location: Iran Posts: 2,186 Rep Power: 16 well always its not related to property of a material. like specific enthalpy is enthalpy per mass flow rate of fluid(1kg/s for example) or specific work(specific work=work/m_dot)that is related to flow of fluid(enthalpy that 1kg of a fluid transfers in 1 second or work 1kg of a fluid does or is done on it in 1s) not the material.but in overall it is correct. totally can say when we want to know how much a quantity we have per length,mass or mass flow rate we use the expression of specific xxx. RodriguezFatz and mouli1991 like this. Last edited by immortality; April 19, 2013 at 11:48.

 April 19, 2013, 10:39 #9 New Member   Sayee chandrasekara mouli Join Date: Mar 2012 Posts: 21 Rep Power: 5 Yep I got that...thank you..specific always to measure quantity and capability of what we take..that's so specific explanation

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