A simple question. In several places, including this very recent and already famous paper
it is stated that bodies lose heat in water very fast due to the big heat capacity of water. I don't understand why heat capacity is relevant for the rate of heat loss. Why does it matter is the temperature of the air around me increases faster than that of water? Unless I am using clothes, that hot air is going away due to convection anyway and is being constantly replaced by new, cold air.
My naive explanation of this would be that we lose heat faster in water because we are essentially made of water and, when submerged, heat is transferred simply via conduction. We lose heat fast because the thermal conductivity of water is large.
So, does the heat capacity of a fluid influence significantly the heat loss rate of a body submerged in it?