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Name: _____________________________________________________ Period:___________ Date: _________________________ Notes on Lab 5.1: When Air Masses Meet Trials 1 & 2 - Same type of air masses: When smoke is entered into convection tubes with the same type of air mass (Cold/Cold or Hot/Hot), the smoke (air) moves: _straight down (if air mass cold) or straight up (if air mass__ warm)_ No smoke (air) moves across, so there is no current! Label the convection tubes and draw arrows showing the direction the smoke (air) moved. Cold-Cold: Air moves slowly down into the convection tube and swirls around the cold-moist surface Hot-Hot: Air moves quickly up and out of the convection tubes – away from the hot-dry surface Cold-Moist Cold-Moist _______________________________________________________________________________________________ Trial 3 - Different types of air masses: When smoke is entered into convection tubes with different air masses (Hot/Cold), the smoke (air) moves: _the hot air mass moves straight up and out of the convection tube, while the cold air _____ __mass moves down and across to fill the void left by the rising hot air. The rising hot air _______ __eventually cools and sinks back down into the cold tube, completing the circle (current!). _____ Label the convection tubes and draw arrows showing the direction the smoke (air) moved. The cold air moves down into the convection tube and then begins moving across to the other tube, where the cold air fills the void left by the rising hot air. Eventually, the cold air warms and rises. Smoke (air) moves across, so there is a current! Hot-Dry Cold-Moist Hot air Cold air rises sinks because its density is because its density is less than cold air. greater than hot air. A convection current is formed when two different types of air masses meet Winds are giant convection currents formed by the uneven heating of the earth’s surfaces and the earth’s rotation.