Aim: To study the factors affecting the rate of heat radiation.

Apparatus and Materials:
aluminium can with shiny surface
stopper carrying thermometer
stopwatch
aluminium can with surface painted blank
a kettle of hot water Oust boiled)
heat-proof mat

Procedures and Observations:
1.  Boil some hot water using the electric kettle.
2. Pour the hot water into the aluminium can with a shiny surface. Put the stopper holding the thermometer into the mouth of the can such that the bulb of the thermometer is dipped inside the hot water.

3. Record the initial temperature reading and start the stopwatch. Record the temperature reading at intervals of 10 seconds for a period of 5 minutes. Tabulate your result below.

Time / s	10	20	30	40	50	60	70	80	90
Thermometer reading / °C

 

Time / s	100	110	120	130	140	150	160	170	180
Thermometer reading / °C

4.    Repeat steps 1 to 3 but now use the aluminium can with the surface painted black. The amount of hot water to be poured in should be the same as before.

Comments

3.20 Copyright (C) 2007 Alain Georgette / Copyright (C) 2006 Frantisek Hliva. All rights reserved."