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Blood pressure readings are always expressed as two values, one high and one low, representing the squeeze (systolic) and relax (diastolic) phases of the heart's pumping.

The units of blood pressure are millimetres of Mercury - that might seem a strange kind of measurement but it's really just seeing how far up a tube the pressure can push a column of mercury. So the full expression is, for example, 120 millimetres of mercury or 120 mmHg. (Hg is the symbol for mercury. It is an abbreviation of the Latin phrase Hydragyrum which means silvery liquid). Mercury is used because its density means that a conveniently short tube can be used.

Normal blood pressure is a reading under 120/80

Pre-hypertension is a reading between this and 140/90

High blood pressure is anything over this.

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