Symbol in context

$\dot{Q}$

This entry links every published equation using this exact notation. Its meaning may change between equations.

Meanings in context

Article-grounded definition

the heat to be removed (watts), $\dot{m}$ is the coolant mass flow rate.

Editorial equation guide

The rate at which the cooling stream removes heat from the load. The dot means “per unit time”. Its SI unit is watts, or joules per second.

\dot{Q} = \dot{m}\, c_p\, \Delta T

This equation states an equality: the expressions on both sides have the same value under the article’s assumptions.

\dot{Q}

the heat to be removed (watts), $\dot{m}$ is the coolant mass flow rate.

\dot{Q} = \dot{m} c_p \Delta T

This equation states an equality: the expressions on both sides have the same value under the article’s assumptions.

\dot{Q} = \dot{m}\,c_p\,\Delta T = \rho\,\dot{V}\,c_p\,\Delta T,

Cooling power equals fluid mass flow × specific heat capacity × temperature rise. Density converts volume flow into mass flow.