American Chemical Society
Energy and Entropy of a Stretched Rubber Band
Stephen Perry invented and patented the modern rubber band in 1845. Young scientists put his discovery to work as they use rubber bands to observe entropy and enthalpy. They determine the change in free energy to figure out if it...
American Chemical Society
Entropy and Enthalpy Changes
My room isn't messy — it's a scientific experiment in entropy! Scholars investigate entropy, enthalpy, and spontaneity through a guided procedure and set of questions. The lesson connects the Second Law of Thermodynamics, energy...
Teach Engineering
Efficiency of a Water Heating System
Tired of waiting for hot water? Groups of three determine the efficiency of an electric water-heating device. They calculate the amount of energy it takes to heat the water and the theoretical amount of energy required to heat the water....
TeachEngineering
Teach Engineering: Efficiency of a Water Heating System
Students use a watt meter to measure energy input into a hot plate or hot pot used to heat water. The theoretical amount of energy required to raise the water by the measure temperature change is calculated and compared to the electrical...
![Entropy and the Second Law of Thermodynamics [Pdf] Activity](https://d15y2dacu3jp90.cloudfront.net/images/attachment_defaults/resource/large/FPO-knovation.png "Entropy and the Second Law of Thermodynamics [Pdf] Activity")
University of Sydney (Australia)
Entropy and the Second Law of Thermodynamics [Pdf]
A set of printable pdf pages from the University of Sydney's "Thermal Physics Module" site. Entropy is defined and explained conceptually. The mathematical treatment of entropy is introduced. The second law of thermodynamics and its...
Science is Fun
Science Is Fun: Rubber Bands and Heat
An experiment to investigate the thermal properties of rubber by studying its behavior in different scenarios. A discussion of how entropy explains what is observed is provided.
Other
Nmsea: Electrolysis: Obtaining Hydrogen From Water
The New Mexico Solar Energy Association provides an article entitled, "Electrolysis: obtaining hydrogen from water - the basis for a solar-hydrogen economy". The article is medium size in length with pictures and charts throughout to help.