Let's say I have a volume $V$ filled with water of temperature $T$. Now I remove a mass of water, $\Delta m$, and I want to know how this affects the temperature in V at first order neglecting all other heat transfer in and out of the volume and other fancy stuff. I would take a simple form of the equation of energy balance so that temperature change in $V$ reflects the energy $Q$ that is taken out:
$$ V\rho c \Delta T = Q $$
where $\rho$ is the density and $c$ is the specific heat capacity.
Now I have 3 questions.
1) Does the removal of the mass have any effect on temperature at all?
If yes, 2) Can I assume that the energy of the removed mass is
$$ Q = c \Delta m T $$
or is this wrong? If it's possible, then 3) do I use temperature in °Celsius or in Kelvin?
$c$ is sometimes reported with °C and sometimes with K, because, as I understand it, it usually relates to a temperature difference rather than absolute temperature (meaning it doesn't make a difference). Used with an absolute temperature (as in this case, unless I'm wrong) it does make a difference though, so I'm not sure how to handle this here.