Water has a relatively specific heat capacity, which means it takes a amount of energy to change its temperature. Metals have a specific heat capacity, which means it takes a amount of energy to change its temperature

Water has a relatively high specific heat capacity, which means it takes a relatively high amount of energy to change its temperature. Metals have a low specific heat capacity, which means it takes a relatively low amount of energy to change its temperature.

Explanation: The specific heat capacity of an object is the amount of heat energy required to raise the temperature of a unit mass of the object( usually in kg) by a unit rise in temperature.

Water is not a very good heat conductor compared to metals.

As such heat is relatively transferred easily to metals as compared to water.

Please note; Good conductors of heat (most likely metals) have low specific heat capacity and vice versa.

PS; The specific heat capacity of water is 4182J/kg°C or 1calorie/g°C.

The specific heat capacity of copper is 385j/kg°C.

Therefore, Water has a relatively high specific heat capacity, which means it takes a relatively high amount of energy to change its temperature. Metals have a low specific heat capacity, which means it takes a relatively low amount of energy to change its temperature.

if the thermos has a vacuum innner, then heat through conv currents and conduction are reduced = vacuum flask

answer: electrons