Blood pressure is usually expressed in terms of the systolic pressure (maximum during one heart beat) pressure over diastolic pressure (minimum in between two heart beats) and is measured in millimeters of mercury (mmHg), above the surrounding atmospheric pressure (considered to be zero for convenience).
Corrosion on the terminals is due to hydrogen gas being released from the acid in the battery. It mixes with other things in the atmosphere under the hood and produces the corrosion you see on the terminals. Generally, if the corrosion is occurring on the negative terminal, your system is probably undercharging.
The cause for corrosion is primarily due to the. presence of dissolved oxygen and carbondioxide. The presence of dissolved. oxygen is found as key cause of feed water, boiler water and even condensate. corrosion in boiler system whereas carbon dioxide is known to cause corrosion in. return line condensate system.