90mmHg

90mmHg refers to a pressure measurement of 90 millimeters of mercury. This unit is commonly used in medicine, particularly for measuring blood pressure. Blood pressure is typically recorded as two numbers: systolic and diastolic. For example, a blood pressure reading of 90/60 mmHg would mean a systolic pressure of 90 mmHg and a diastolic pressure of 60 mmHg. The systolic pressure represents the force of blood against artery walls when the heart beats, while the diastolic pressure represents the force when the heart rests between beats. A reading of 90 mmHg for either systolic or diastolic is generally considered low in adults, but what is considered normal can vary slightly based on age, individual health, and other factors. In specific medical contexts, such as during certain surgical procedures or for individuals with particular conditions, 90mmHg might represent a target pressure or a value requiring attention. The unit "mmHg" itself is derived from the height of a mercury column that a given pressure can support.