Words to Know | |
A useful and continually updated glossary of spa terms. | |
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| There are 2 entries in the glossary. | |
| Pages: 1 | |
| Term | Definition |
| Ultrasound | a cyclic sound pressure with a frequency greater than the upper limit of human hearing; this limit being approximately 20 kilohertz (20,000 hertz) |
| Ultraviolet light | Radiation lying in the ultraviolet range; wavelengths shorter than light but longer than X-rays. |
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