Different types of pressure.
There are two basic pressure types - absolute and gauge - distinguished by what pressure they are compared to, which is called the reference pressure.
Atmospheric pressure: Pressure related to the atmosphere that surrounds the earth is atmospheric pressure. This pressure is weather-dependent.
Gauge pressure: This is the difference between absolute pressure and atmospheric pressure.
Systolic pressure: The blood pressure during the contraction of the left ventricle of the heart.
Diastolic pressure: The blood pressure after the contraction of the heart while the chambers of the heart that refill with blood.
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