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Heat loss from animals

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Introduction

Saira Hamid 11CM BIOLOGY COURSEWORK Heat loss from animals Investigation: To investigate heat loss from animals. Aim: To find out how body size affects the rate of heat loss. Background: The way heat is transferred from the animal to its surroundings can be done in three ways, convection, conduction and radiation. Convection: hot gases expand and become less dense, therefore rise and are replaced by cooler gases this is called the cooling affect. This happens in animals with less body coverings. Where the environmental temperature has a greater difference to that of the animal. Conduction: is when molecules transfer heat vibrating and passing on the vibration. This occurs when the animal is in direct contact with a surface, so the vibration molecules are passed from the animals' feet to the surface it is in contact with. Radiation: there are no molecules are involved in this type of heat transfer, so therefore the heat is transferred by waves. Some animals such as the polar bear, which lives in arctic conditions, has had to adapt in its environment, because it has to decrease the amount of heat loss and instead conserve the heat. ...read more.

Middle

3) Walk around the lab sensibly considering that other students are also doing an experiment. 4) Use a heatproof mat to put the gauze and Bunsen and other hot apparatus down on it. 5) Make sure all loose hair is tied back due to using Bunsen's. Diagram: Method: 1) Pour some tap water into a beaker with a thermometer. 2) Heat this until it reaches about 36�C because temperature rises once heat is take away. 3) Take away the Bunsen and wait until the temperature rises to 40�C. 4) Pour this into a test tube starting with the smallest and working your way up to the largest. 5) After each minute has gone record the temperature of the water and record the results in a result table like the one in the preliminary work. Results: Experiment 1: Time (min) Test tube 1 Temperature (�C) Heat loss (�C) Test tube 2 Temperature (�C) Heat loss (�C) Test tube 3 Temperature (�C) Heat loss (�C) 0 40 0 40 0 40 0 1 34 6 36 4 37 3 2 32 8 33 7 35 5 3 31 9 31 9 34 6 4 30 10 30 10 32 8 5 28 12 29 11 31 9 Experiment 2: Time (min) ...read more.

Conclusion

I also think that my results are reliable because I have not got any anomalous results and if it was not reliable this would have shown up in my graphs and results. But the only thing I would improve is maybe do the experiment for 10 min and see what happens and where does the temperatures start getting constant. I know that my experiment was a fair test because I repeated it twice and the results were all very similar there was not any that really had a major difference amongst them. My experiment turned better than I expected it to so I was really pleased with the out come. I think that the accuracy of this experiment was maintained very well and I did this by: 1) Making sure that the thermometer was always at the same degree each time we placed it into a test tube 2) Reading the measurements of the thermometer at eyelevel. 3) Taking readings more than once and tallying up the average. The experiment can be extended by also investigating other factors that could affect heat loss, such as the environmental temperature, body covering and also behavioural. You could take any one of these and compare how it is related to the body size of the organism. ...read more.

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4 star(s)

****
A good account of the investigation. A little more detail in the method would have been useful and there is a lack of clarity about what the independent and dependent variables actually are.

Marked by teacher Adam Roberts 30/07/2013

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