hello! I'm investigating on thermal conductivity of concrete blocks. I've got an equation for calculating K, which is Fourier's law. Q'=-k×A× ∆T/l I have to make the experiment simple as possible as i can. My plan is to heat one side of a block of concrete and measure the temperature difference then the put the all values needed in the equation. I can get values of A(area), ∆T(temp difference) and l(length of the block). but i really don't get what Q' is. i have no idea and nothing have clued me up yet. could anyone teach me what it means and how to get the value of Q' for my experiment? (assume that i can get whatever that is needed for the experiment) Available apparatus from my school are Joulemeter, power supply and thermocouple etc the really important thing is 'how to measure the value' God will bless replier thank you!!