Sections View Full Chapter Figures Tables Videos Full Chapter Figures Tables Videos Supplementary Content ++ Table Graphic Jump LocationFavorite Table | Download (.pdf) | Print Milliseconds (msec) = 1/1000 of a second Microseconds (μsec) = 1/1,000,000 of a second Nanosecond (nsec) = 1/1,000,000,000 of a second Milliamp (mA) = 1/1000 of an ampere Microamp (μA) = 1/1,000,000 of an ampere Angstrom (Å) = 1/10,000,000,000 of a meter Nanometer (nm) = 1/1,000,000,000 of a meter Hertz (Hz) = 1 cycle per second Kilohertz (KHz) = 1000 cycles per second Megahertz (MHz) = 1,000,000 cycles per second GET ACCESS TO THIS RESOURCE Sign In Username Error: Please enter User Name Password Error: Please enter Password Forgot Username? Forgot Password? Sign in via OpenAthens Sign in via Shibboleth Get Free Access Through Your Institution Contact your institution's library to ask if they subscribe to McGraw-Hill Medical Products. Access My Subscription GET ACCESS TO THIS RESOURCE Subscription Options Pay Per View Timed Access to all of AccessPhysiotherapy 24 Hour $34.95 (USD) Buy Now 48 Hour $54.95 (USD) Buy Now Best Value AccessPhysiotherapy Full Site: One-Year Individual Subscription $595 USD Buy Now View All Subscription Options