Colour Of The Test Tube Effects example essay topic
435 words
Does the Colour of a Liquid Effect How Fast it Cools? I am trying to find out if the colour of a liquid effects how quickly it cools down. Method: 1. First I took five test tubes and filled each one with 5 ml of black, blue, green, red and 'clear' colouring (for the 'clear' colouring I simply used water.) 2. I then filled each of the test tubes with 25 ml of boiling (of course whilst wearing safety goggles.) water and waited for the temperature to fall to 50^0 C and then measured the temperature of the water, using thermometers, every 30 seconds for three minutes. 3. I recorded our results and repeated the experiment to make the test fairer. Diagram: My diagram can be found in the plastic wallet this was handed in with. Equipment: o 5 standard test tubes. o 5 thermometers. o Four colour dyes, black, blue, green and red. o A stop watch. o A kettle. Prediction: I think that the colour of the liquid will effect how quickly it cools down because I know that dark matt surfaces are better at absorbing radiation.
Therefore, according to my theory, the darker dyes such as the black, blue and green will cool slower than the lighter ones. I then worked out the total temperature loss for each colour and put them into this table: Red Green Blue Black Clear Total Temperature Loss in ^0 C 10 4 10 11 13 I then put the results into this bar chart: Conclusion: My results seem very strange and almost contradict my prediction. All the results seem quite similar, except the green dye, which, of course, could simply be an anomalous result. Therefore my conclusion is that the colour of a liquid makes no difference to how quickly it cools down. Evaluation: I understand that my experiment was not at all completely accurate.
To be so I would need to do it in a controlled, stable environment, but this was not available to me. However there were some factors that could have been changed to make the test fairer, such as repeating the experiment more than twice, and the darkness of the dyes. I think that this evidence collected is not very reliable, and the experiment would need to be completed a large number of times for this to be so. An interesting experiment to follow up this one would be finding out if the colour of the test tube effects how fast the contents cool.
