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Convection Essay

620 words - 2 pages

Introduction Heat is transferred through convection, conduction and radiation. Convection is the transfer of heat through the movement of matter. Conduction is the transfer of heat or energy between two objects that are in contact with each other. Radiation is the transfer of energy through electromagnetic waves. In this lab we conducted four separate experiments. The experiments test to see how convection currents cause effects on an ecosystem.Experiment 1 In this experiment, we tested to see if liquids in an ecosystem could cause convection currents. We poured hot water into a flask. We colored it with half a teaspoon of potassium permanganate (just to distinguish it from others). The flask was plugged with a double-holed rubber stopper. The purple colored water in the flask sunk to the bottom of the graduated cylinder.Analysis 1 The purple dyed water came out of one of the glass droppers into the large portion of hot water, which wasn?t as hot as the water in the flask. The purple water reached the surface while the clear water was being pushed down. This illustrated convection of liquids. The currents eventually reached thermal equilibrium and convection stopped. All the water was purple and reached one temperature.Experiment 2 There was a cardboard juice box container that was cut in the middle to create a window. Two holes were made on the top and sticking out of the holes were cardboard toilet paper roles. Inside the box was a small crucible containing hydraulic acid, ammonium hydroxide and directly under the toilet paper roll was a lit candle. The window was covered with plastic wrap so that nothing could...

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