Largest Peninsulas of World : Arabian Peninsula. Arabian Peninsula or Arabia is the largest peninsula of world which occupies an area of 3.2 million square Km. It is located in middle east and comprises of 7 countries including Saudi Arabia, Oman, Yemen, UAE, Kuwait, Bahrain and Qatar.
Pressure is merely force per area, so if the force increases but the box stays the same size, the pressure has increased. Air density can decrease with temperature if pressure is also decreasing. If pressure is constant, this cannot happen (they would be inversely related). Any time you specify a relation between any two of pressure, density or temperature you must hold the third constant or specify its behavior.
How much does air weigh? It might not seem like it, but air has weight. Anything with mass has weight, and we know air has mass because (for example) we can feel it when the wind blows. The total weight of the atmosphere exerts a pressure of about 14.7 pounds per square inch at sea level. You don't notice this weight, however, because you are used to it. If you live in Denver, Colorado, which is at an elevation of about 5,000 feet, then about 85% of the atmosphere is above you, resulting in an air pressure of about 12.5 pounds per square inch.