The higher temperature means that the engine is hotter and the pressure is greater, which means that the fuel-air mixture will ignite prematurely. Case 3, page 317. On a sunny morning at the seashore, the sun warms the land quickly while the sea remains cool. Its density decreases because as the air becomes hotter, the molecules move further apart. High altitude air begins to flow from over the land to over the water.
Air flows from hot to cold.
It begins to flow toward the lower pressure air over the land and a land breeze forms. Cold to hot. Air moves around in a cycle, transferring thermal energy from one region to another, which is a form of a heat engine. While it flies at high altitudes, a jet airplane must continually replace its cabin air with fresh air from outside. But because that outside air is very cold and its pressure and density are both quite low, the plane must compress the air.