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.
How to tell which battery terminal goes on the positive side of the battery and which terminal goes on the negative side. I have found that most people are unaware that battery terminals are positive and negative. If you ever had trouble installing one, there is a good change it is the wrong terminal.ow to tell which battery terminal goes on the positive side of the battery and which terminal goes on the negative side. I have found that most people are unaware that battery terminals are positive and negative. If you ever had trouble installing one, there is a good change it is the wrong terminal.