Skip main navigation


Example: conversion of potential energy to enthalpy energy

We have a box which is adiabatic and closed. Pressure outside of box is constant at P. Inside this box, water at 25 ℃ is contained in a cup located at the bottom of box. A lead ball with mass m and temperature of 25 ℃ is initially at a height of h in this box. The lead ball falls down to the bottom of box. After this event, what might be the final temperature of water and the lead ball?


In this example, the potential energy is converted to other form, increasing the energy of the system

This article is from the free online

Thermodynamics in Energy Engineering

Created by
FutureLearn - Learning For Life

Reach your personal and professional goals

Unlock access to hundreds of expert online courses and degrees from top universities and educators to gain accredited qualifications and professional CV-building certificates.

Join over 18 million learners to launch, switch or build upon your career, all at your own pace, across a wide range of topic areas.

Start Learning now