# Speed Of Light in Air and Water

Shows Dr. William M. Siebert outdoors at night as he measures the speed of light in air using a spark-gap, parabolic mirrors, a photocell, and an oscilloscope. In the laboratory he compares speed in air and in water using a high speed rotating mirror. For more info on PSSC films and their history, visit http://www.afana.org/psscfilms.htm

- Kind: Educational
- Year: 1960
- Runtime: 21 min
- By: Physical Science Study Committee.; Educational Services, Inc.; Modern Talking Picture Service, inc.
- Genres: Education, Science
- Archive: [Internet Archive](https://archive.org/details/SpeedOfLightInAirAndInWater)
- Licence or status: none stated by the archive
- Who can watch: Kids profiles and older (the archive gives no rating; placed by Invisible Network from its collection and subjects)

[Watch now](https://invisiblenetwork.ai/watch/archive/ia/SpeedOfLightInAirAndInWater?play=1)