-ISOBARIC-

Assalamualaikum w.b.t

Saya NUR ATHIRAH BINTI YUSLI (13DEM19F1003) ingin berkongsi sedikit ilmu yang telah saya pelajari baru-baru ini. Saya ingin menceritakan dan berkongsi sedikit sebanyak tentang 'ISOBARIC PROCESS'.

An Isobaric process is a thermodynamic process in which the pressure stays constant: ΔP = 0. The heat transferred to the system does work, but also changes the internal energy of the system. This article uses the physics sign convention for work, where positive work is work done by the system. Using this convention, by the first law of thermodynamics,

The yellow area represents the work done

Q = ΔU−W

where W is work, U is internal energy, and Q is heat.[1] Pressure-volume work by the closed system is defined as:

W = ∫pdV

where Δ means change over the whole process, whereas d denotes a differential. Since pressure is constant, this means that

W = pΔV

Applying the ideal gas law, this becomes

W = nRΔT

assuming that the quantity of gas stays constant, e.g., there is no phase transition during a chemical reaction. According to the equipartition theorem,[2] the change in internal energy is related to the temperature of the system by

ΔU = nCPΔT

where cP is specific heat at a constant pressure.

Substituting the last two equations into the first equation produces:

Q  = nCPΔT−nRΔT

Q  = nΔT(CP−R)