But its potential to kill workers in or near confined spaces should never be underestimated. On Nov. 5, 2005, two contractors working at Valero Energy Corp.'s Delaware City, Del., oil refinery died from nitrogen asphyxiation.
The hertz (symbol Hz) is the unit of frequency in the International System of Units (SI) and is defined as one cycle per second. It is named for Heinrich Rudolf Hertz, the first person to provide conclusive proof of the existence of electromagnetic waves.ach musical note corresponds to a particular frequency which can be measured in hertz. An infant's ear is able to perceive frequencies ranging from 20 Hz to 20,000 Hz; the average adult human can hear sounds between 20 Hz and 16,000 Hz.
For the sound wave we use Hertz as the unit of measurement where 1 Hertz = 1 vibration/second. Conceptually whenever a wave passes the medium it makes the first particle to which it comes in contact, vibrate. Then this particle vibrates the nearby particle at the same frequency. This is how energy is propagated.