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Feedback from the course questionnaire

In the last weeks of the course we invited learners to complete a questionnaire to provide data for our on-going research on pedagogy. We promised to provide feedback on the …

An invitation

This free online course provides a taste of the University of Liverpool’s Mechanical Engineering and Aerospace Engineering degrees. And if you are a fully participating learner in Energy: Thermodynamics in …

Course farewell

The end! Eann reflects on the course and the role of teachers and engineers in our lives. We have done quite a few things differently in this online course and …

Wrap up

Gibbs energy allows us to account for the entropy change in the environment due to a system-based process by using system properties and without analysing the environment. Gibbs energy must …

Beyond absolute zero

A recent article in Science Magazine has hinted that it is theoretically possible to go beyond absolute zero and have negative Kelvin temperatures. This has some interesting potential implications for …

Superconductivity

Superconductivity has unlocked a number of technological advances as well as new areas of study. If you are not sure that you understand superconductivity and what it is, or would …

Air powered car (worked example)

Calculate the available energy (change in Gibbs energy) in a 100 litre tank of compressed air at 248bars if it is released isothermally through an air-motor to power a vehicle. …

Gibbs function

The concept of Gibbs Energy or Gibbs Function was introduced in the previous unit. In this article, it is used in the derivation of the isentropic relations for an ideal …

Gibbs Energy

Gibbs Energy is important in the analysis of chemical and biological processes. It is derived by combining the first and second law of thermodynamics as shown in this article. Gibbs …

Introduction

In this week we will combine the first and second laws of thermodynamics following the example of Willard Gibbs which will lead to the concept of free energy. Watch Eann …

Wrap up

Entropy is a measure of disorder. The second law of thermodynamics states that entropy increases in all real processes. A century and half ago, Kelvin expressed it as ‘no engine …

Spark ignition engine (worked example)

A spark ignition engine operates in an ideal Otto cycle. In each cycle it uses 7mg of gasoline that combusts at its flash point of 232°C and has a Net …

Ideal performance

Heat engines convert heat or thermal energy into useful work, often shaft power that can be used to turn wheels for transportation or generators to produce electricity. In one sense, …

Refrigerators

Moving energy around as heat from cold spaces to hot ones takes some doing! Eann explains how a refrigerator manages this. Your humble fridge can even be used to heat …