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.
(Follow-up to zinc sludge question). I would like to present you with another cause for excessive zinc sludging and the solution. I have found that continual, excessive sludging in phosphate coating tanks is caused by the reaction of the low pH phosphate coating liquid with calcium in the water.Follow-up to zinc sludge question). I would like to present you with another cause for excessive zinc sludging and the solution. I have found that continual, excessive sludging in phosphate coating tanks is caused by the reaction of the low pH phosphate coating liquid with calcium in the water.