GROUP MEMBERS NURHAYATI AMIRUDINNOR HAFIZAH ISMAIL SITI NURHAFIZA MUHAMMAD NAWI
INTRODUCTIONThe concept of heat transfer and thevarious mechanisms that result inheat transfer:• a) Conduction• b) Convection• c) Radiation
ENGAGE I can remember as a kid having one dull blackthermos bottle that came with my lunch box. Oneday my mother might put grape juice in it and atlunch, I would have nice, cold grape juice. The nextday she would put hot soup in it and I would havehot soup for lunch. Moreover, I can rememberasking, "How does it know whether to keep stuff hotor cold?" Wheres the switch, in other words,similarly, "You heat things up in an oven and coolthem down in a refrigerator. How come this thingcan do both?"
QUESTION How the thermos bottles keep the food warm and cool? How a thermos bottle prevents heat transfer to the outside by using a vacuum between the walls of the bottle? What is a link between the colour of the flask and how quickly the heat was lost? Why one coloured flask cooled more quickly than another did? What made up the wall of the flask?
EMPOWERObjective: To investigatehow colour can affectthe heat lost throughradiation. Hypothesis: Black colour absorbed more heat than light colour. The light colour reflect more heat.
Equipment required:- DrDAQ data logger connected to a PC-Two external temperature probes (DD100)-One 250 ml conical flask painted black and one with silverfoil around it-A kettle or other resource to boil water-Two pieces of insulating material to place over the top ofthe flasks be (these will have to be made with a small holeto let the temperature probe into the flask)-Two clamp stands
Experiment Procedure• Both the conical flasks is filled with boiling water• The insulating covers is placed over the top of the flask• The temperature probes is placed in the flasks• The temperatures of the flasks is started recording(15 minutes should be long enough)
ENHANCEPlanning a further experiment.These questions below help us to find the solution how to improve this product to be more attractive and funky. Can you design an experiment to discover if different coloured flasks full of water would heat up more quickly than others would? Show your teachers your design Why was an insulating cover placed over the top of the flask?
EXTENSIONExample of Greenhouse Plant-Light from the sun passes through the roof of the greenhouse to heat the plants and ground inside.-Once the solar radiation reaches the surface of the earth, the greenhouse structure is the next obstacles it has to pass through.-The roof and wall are usually opaque and absorb or reflect of the light.-A greenhouse is build with the glass walls and glass roof.- It allow a visible light to enter unhindered, where it warms the interior as it is absorbed by the material within.