So, i just opened a soda can that hadn't been refrigerated and upon drinking it, the soda felt much colder than i would have expected from where it was stored. i realize that the cans are pressurized from the co2 and that on opening they lose this pressure. to my understanding the when a pressure vessel such as this one is rapidly depressurized cooling occurs. is the pressure that the soda can holds enough to significantly change the temperature upon opening? It does not seem likely that the thermal mass of the soda itself could be changed to a significant extent by the pressure alone. I haven't measured the temperature of the soda (in fact its gone now) but does this seem to be a reasonable explanation for why it feels cold?