Sentences with phrase «upward air current»
A shopvacuum balances a beach ball onits upward air current; a humidifier, hooked up to an aquariumtank, gurgles out thick, white vaporthat students can touch andpour into cups.
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The strong temperature gradient created by fires — between the hot flame and the cooler air surrounding it — can create a vortex; if the air currents and wind conditions are just right, the fire can travel upward in a whirling column.
The swirling dislodged particles travel upward with the human convection plume, or currents of warmed air that rise around any human body, then get swept into a filter that takes out contaminants like dust, lint, and skin cells.
As birds swing their wings upward, the feathers separate like window blinds to let air through, which prevents the lift - reducing currents that the bats experienced, the researchers say.