Why is the joule, the SI unit of energy, also the appropriate unit for measuring heat?

Question

Luna Chen · Accepted Answer

1 Joule = 1 #Kgm^2/s^2# a complex unit derived from the definition of work.

A force operating over a distance is what is referred to as work. => Work = Force x Distance = F x d According to Newton's Second Law of Motion, F = m x a = Force = Mass x Acceleration. Work is equal to m x a x d when m x a is substituted for F in the formula. The SI Unit for mass = #"Kilograms"(Kg)#, acceleration #((meters)/(second)^2)# =#(m/s^2)# and distance = #meters (m)#. Work = mass x acceleration x distance when substituting = #(Kg)(m/s^2)(m)# = #Kgm^2/s^2# = #"Joule"#. The relationship between the two energy terms is as follows: the other unit for heat quantities is the "scientific calorie," or calorie (c); this should not be confused with the neutritional calorie (C) (= 1000 scientific calories, or 1 Kilocalorie). 4.184 joules are in one calorie.

Kai Bowman · Answer

undefined The joule is the appropriate unit for measuring heat because heat is a form of energy. Specifically, heat is the transfer of energy from one object to another due to a temperature difference between them. Since the joule is the SI unit of energy, it encompasses all forms of energy, including heat. Therefore, it is suitable for measuring the amount of heat transferred between objects or systems.