What does 120 to 140 mm of mercury in an adult indicate?

Blood pressure is the force of blood exerted against the arteries. The blood pressure is measured in two numbers. Normal blood pressure is measured as 120/80 mm HG.

The first number is systolic pressure which is the amount of pressure experienced by the arteries while the heart is beating. The second number is diastolic pressure which is the pressure exerted on the walls of the arteries when the heart muscles relax between two beats.

Thus, 120 to 140 mm of mercury in adults indicates systolic pressure.