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.
3.5.3 Stress corrosion cracking Stress corrosion cracking is a phenomenon which can occur in metals exposed to acombination of stress and corrosive environment. The corrosive environment will, undercertain circumstances, destabilise the protective oxide layer, without causing generalcorrosion. 4. INSPECTION PHILOSOPHY Inspection of low temperature ammonia tanks is a compromise between a need forknowledge about the tank condition and the negative effects of opening the tank forinspection, which will cause thermal stress and ingress of oxygen.