Pressure groups are also known as interest groups, which is a structural grouping that seeks to influence government policy or government actions. They differ from a political party because they do not seek to win government but to influence those who win government. They are usually more narrow than a political party and generally single issue politics. The first pressure abolition society 1787 to appose slave trade.
In other words, a pressure group is an organization that tries to advance specific causes, issues, or interests.
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Gauge pressure is what you get when you take the reading from your tire pressure gauge. Absolute pressure is the pressure inside your tires plus the atmospheric pressure, which is roughly; 14.7 psi, 101.3 kPa (kilo-Pascals), or one atmosphere. Absolute pressure measures all of the pressure on your tires, inside and out, whereas gauge simply measures the pressure inside the tire.
Absolute pressure is simply the addition of the observed gage pressure plus the value of the local atmospheric pressure.
The pressure inside will be the same as what the atmospheric pressure was when the lid was closed as long as no heat is added or removed.
You might use the definition of pressure: pressure = force / area.