In this experiment, the rate of evaporation is being measured. The temperature of
the boiling water is also being measured every 30 seconds for 10 minutes. The
child thermometer is also being used to measure the temperature. Three
temperature changes are being made. The accuracy of the thermometer is being
discussed. The stirring of the liquid before taking the temperature is also being
discussed. Lastly, parallax is discussed.
The experiment shows which of the metal is the best conductor of heat-
experiments such as this one can be helpful in understanding how heat travels.
The student is asked to suggest an improvement to the experiment, and he
suggests placing several p's along each word astro anyhow quick the piece
dropped through the rod actually tells you how fast the heat travels. Students
also suggest that the area of water surface will affect the rate of cooling of hot
water in a container. A plan is developed to investigate the relationship between
surface area and rate of evaporation. The experiment is performed by using
square shaped pans and determining their surface area using length into grid
which can be measured using rate on the yaxis straight line. A thermometer is
used to measure the initial and final temperatures of the block. A heater is
stretched on for four minutes and the temperature rise to the block is 15 degrees.
The final temperature is taken a short time after the heater has been switched
off.