PHYSICAL QUANTITY

Amount of heat: formulas and units of measurement

Amount of heat: symbol Q, unit J. Formulas and explanations for MCT and thermodynamics, Electricity.

Q

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joule

KEY CONNECTIONS

Formulas

Q = m c Δ t

Q = mcΔt

Q = m λ

Q = mλ

Q = m r

Q = mr

Q = I^{2} R t

Q = I²Rt

Q = Δ U + A

Q = 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