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My venerable sliderule tells me that for every K° you heat the stone its mass will increase by 0.000001534% (it would have to be very hot before you noticed any difference)

Just thinking about Einstein's famous formula linking energy and mass, E=mc^{2}. Since temperature is a form of energy, does it mean that, say, a stone gets heavier as it gets warmer?Tomten

I did not include specific heat in my calculation therefore I must have assumed it was 1.I worked via the temperature equivelent of 1 ev, the energy equivelent of 1 ev to give me Joules then applied E=mc^2 to obtain the mass increase.Is there a more simple way ?.

I think this mixing of classical and relativistic ideas is on a hiding to nowhere. The statistics of a system which is hot enough to be getting in the region of E = mcsquared for particles, is going to affect the 'specific heat capacity'. You would be in the range of plasma behaviour and any energy put in would certainly not just go into translational KE.Newtonian sums go out of the window and so would the simple kinetic theory calculations. The population of particle energies would be nothing like the classical model.Here be dragons.