weather

Efficiency is reduced because the propeller exerts less force at high density altitudes than at low density altitudes. Efficiency is reduced due to the increased force of the propeller in the thinner air. Efficiency is increased due to less friction ...

An air mass moving inland from the coast in winter. A warm, moist air mass on the windward side of mountains. A light breeze blowing colder air out to sea.

Turbulence and showery precipitation. Haze and smoke. Poor visibility and smooth air.

It increases performance. It has no effect on performance. It decreases performance.

Warm, moist air over low, flatland areas on clear, calm nights. Moist, tropical air moving over cold, offshore water. The movement of cold air over much warmer water.

Good visibility and steady precipitation. Poor visibility and intermittent precipitation. Poor visibility and steady precipitation.

High temperature, high relative humidity, and high density altitude. Low temperature, low relative humidity, and low density altitude. High temperature, low relative humidity, and low density altitude.