PHYSICAL QUANTITY

Heat: formulas and units of measurement

Heat: symbol Q, unit J. Formulas and explanations for MCT and thermodynamics, Electricity.

QQ\text{Дж}joule

KEY CONNECTIONS

Formulas

Q=mc\Delta tQ = mcΔt

Q=m\lambdaQ = mλ

Q=mrQ = mr

Q=I^2RtQ = I²Rt

Q=\Delta U+AQ = ΔU + A

NOTATION

Q: The amount of heat is the energy received or given off by a body during heat exchange.
m: Mass is a scalar physical quantity that is a measure of the inertia of a body.
c: Specific heat capacity is the energy required to heat a unit of mass by one degree.
\Delta t: Temperature change is the difference between the final and initial body temperatures.
\lambda: Specific heat of fusion is the energy required to melt a unit mass of a substance.
r: Specific heat of vaporization is the energy required to convert a unit mass of liquid into vapor.
I: Current strength is the charge passing through the cross section of a conductor per unit time.
R: Electrical resistance is a measure of a conductor's resistance to electric current.
t: Time is a quantity characterizing the duration and sequence of events.
\Delta U: The change in internal energy is the magnitude of the change in the energy of the particles of the system.
A: Work is a measure of energy transferred when a force is applied.

THEORY

PRACTICE