James Prescott Joule, British physicist

James Prescott Joule, British physicist

H410/0057 Rights Managed

Request low-res file

530 pixels on longest edge, unwatermarked

Request/Download high-res file

Uncompressed file size: 29.3MB

Downloadable file size: 4.9MB

Price image Pricing

Please login to use the price calculator


Credit: SCIENCE PHOTO LIBRARY

Caption: James Joule. Portrait of James Prescott Joule (1818-89), the British physicist who discovered the mechanical equivalent of heat. In 1840 Joule described the Joule effect, stating that the heat generated in a wire by an electrical current was proportional to the resistance and the square of the current. He made a series of accurate measurements to show that a given quantity of work, from whatever source, always produced a particular quantity of heat. From this he deduced that energy was never destroyed, but was always conserved in a different form. He also showed that the tempera- ture of a gas falls as it expands, even when it does no external work.

Release details: Model release not available. Property release not required.

Keywords: conservation of energy, electricity, gas chemist, heat, james prescott, joule, physicist, pioneer, portraits, surname j, thermodynamics

Licence fees: A licence fee will be charged for any media (low or high resolution) used in your project.