Hertz
Hertz (Hz)
Hertz (pronounced: hɜːrts) is the unit of frequency in the International System of Units (SI). It is defined as one cycle per second. The unit is named after Heinrich Rudolf Hertz, a German physicist who made significant contributions to the study of electromagnetism.
Etymology
The term "Hertz" is derived from the name of German physicist Heinrich Rudolf Hertz. The International Committee for Weights and Measures adopted hertz as an SI unit in 1930.
Usage in Medicine
In the field of medicine, hertz is often used in the context of electrocardiography (ECG) and electroencephalography (EEG). These tests measure the electrical activity of the heart and brain, respectively, in hertz.
For example, a normal resting heart rate for adults ranges from 60 to 100 beats per minute, which can be converted to 1 to 1.67 hertz. Similarly, EEG waves are typically classified into different types (delta, theta, alpha, beta) based on their frequency range in hertz.
Related Terms
- Frequency: The number of occurrences of a repeating event per unit of time. It is measured in hertz.
- Electrocardiography (ECG): A medical test that detects heart abnormalities by measuring the electrical activity generated by the heart as it contracts.
- Electroencephalography (EEG): A test that measures and records the electrical activity of your brain.
- Heinrich Rudolf Hertz: A German physicist who first conclusively proved the existence of electromagnetic waves.
External links
- Medical encyclopedia article on Hertz
- Wikipedia's article - Hertz
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