①After a certain process, the temperature changes to △t, which absorbs (or releases) heat. Q means heat (J)
Q=c m Δt.
(t0 is the initial temperature; t is the final temperature)
where C is the specific heat (capacity) associated with the process.
The unit of heat is the same as that of work and energy. The unit of heat in the International System of Units is Joule (referred to as Joule, abbreviated as J) (to commemorate the scientist Joule). Historically, the unit of heat has been defined as calorie (abbreviated as calorie, abbreviated as cal), which is only used as an auxiliary unit of energy, 1 calorie = 4.184 joules.
Note: 1 kilocalorie=1000 calories=1000 calories=4184 joules=4.184 kilojoules
The equilibrium relationship between the heat absorbed by a certain area and the heat released and stored in a certain period of time.
②The formula for calculating the heat released by the complete combustion of solid fuel: Q = mq The calculation formula for the heat released by the complete combustion of gaseous fuel: Q = Vq Q represents the heat (J), q represents the calorific value (J/kg), m represents the mass (kg) of solid fuel, and V represents the volume (m^3) of gaseous fuel.
q=Q release/m (solid); q=Q release/v (gas)
W=Q amplifier=qm=Q amplifier/m W=Q amplifier=qV=Q amplifier/v (W: total power)
(calorific value is related to pressure)
SI International Units:
Q———The heat released after a certain fuel is completely burned——Joule J
m——indicates the mass of a certain fuel——kilogram kg
q——Indicates the calorific value of a certain fuel——Joules per kilogram J/kg
Heat energy calculation formula
(Specific heat capacity is C, mass is m, Δt is temperature difference)