For an isobaric process, what are the expressions of the First Law and the enthalpy change?
Formula: Q p = Δ U + pΔ V = Δ H, and Δ H = n C(p,m) Δ T. Explanation: In a constant pressure process, the heat absorbed by the system Q p equals the increase i…
Syllabus path: Thermal Physics › First Law of Thermodynamics
CSCA Exam Prep
This formula is aligned to the CSCA undergraduate admissions exam syllabus. Continue with the linked tutorial and topic practice.
Practice related questions (4) · Start mock exam · Sign up — AI explanations · Membership plans
CSCA Physics Formula Reference
Formula and explanation
Formula: Q p = Δ U + pΔ V = Δ H, and Δ H = n C(p,m) Δ T. Explanation: In a constant pressure process, the heat absorbed by the system Q p equals the increase in internal energy Δ U plus the work done by the system pΔ V. This sum is defined as the enthalpy change Δ H. C(p,m) is the molar heat capacity at constant pressure. Applicability: Isobaric process of an ideal gas.
Related tutorial and examples
First Law of Thermodynamics
First Law of Thermodynamics 1. Core Concepts & Sign Convention The First Law of Thermodynamics is essentially the Law of Conservation of Energy applied to thermal processes. For a system (like gas in a cylinder), the change in internal energy Δ U equals the sum of heat Q supplied…
Plan your next CSCA study step
Use this topic in a focused practice set, then connect it to the exam requirements and timed papers.