Everyday Measurements

Satuan Tekanan Darah

Definisi

Tekanan darah diukur dalam milimeter merkuri (mmHg), dinyatakan sebagai dua nilai: tekanan sistolik (jantung berkontraksi) di atas tekanan diastolik (jantung istirahat), misalnya 120/80 mmHg.

Penjelasan

The unit dates to the mercury manometers used in early sphygmomanometers, where pressure literally raised a column of liquid mercury. Normal adult blood pressure is below 120/80 mmHg; hypertension stage 1 begins at 130/80 mmHg. Although mercury instruments are now largely replaced by electronic sensors for safety reasons, mmHg remains the universal clinical standard because of its century-long reference base.

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RELATED TERMS

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Angka Ukuran Ban

Ukuran ban dikodekan dalam format Lebar/RasioAspek R Diameter (misalnya, 205/55 R16), di mana lebar dalam milimeter, rasio aspek adalah tinggi dinding samping sebagai persentase lebar, dan diameter adalah ukuran pelek roda dalam inci.