• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Rate of heat loss

Extracts from this document...

Introduction

Planning (a) Aim: To investigate the factors which affect the rate of heat loss from a body. Theory: In this experiment we will study how several factors affect the rate of heat loss by carrying out investigations to test different hypotheses made concerning size, insulating layers, speed of evaporation of water, surrounding medium, etc. Several observations and claims can be explained using theoretical knowledge about the nature of a body and the rate of heat lost from it. 1. Short and fat people tend to lose heat more slowly than tall and thin people of the same body weight because their surface area to volume ratio is much smaller. As the rate of heat loss is directly proportional to the surface area volume ratio this means that even though the body weight is constant, this rate is higher in tall thin people than in short fat ones. 2. Several thin layers of clothing (insulating layer) keep you warmer than one thick layer as they contain a lot of air spaces in between which help to trap heat and hence reduce heat loss. As these tiny pockets containing air are absent in a single layer, it has poorer insulating action. Hence it can be concluded that several thin layers of clothing are more efficient at reducing heat loss than one thick layer. ...read more.

Middle

Investigating hypothesis 4: * Around 5-6 test tubes were individually covered with a layer of tissue paper. * A rubber band was used to tie the test tubes together in a group. * All of the test tubes were filled with hot water. * A thermometer, which was initially at room temperature, was placed into the test tube at the centre of the bundled group and allowed to reach the highest temperature. * The stopwatch was started and the temperature was recorded at regular intervals of 1 minute. * A single test tube was covered with a layer of tissue paper similar to that around each of the test tubes in the group. * A thermometer, which was initially at room temperature, was placed and allowed to reach the highest temperature. * The stopwatch was started and the temperature was recorded at regular intervals of 1 minute. Investigating hypothesis 5: * A beaker, which was large enough to fully contain a test tube, was filled with water at room temperature. * Then a test tube was taken and filled with hot water. * A thermometer, which was initially at room temperature, was placed inside the test tube and it was allowed to reach the highest temperature. ...read more.

Conclusion

The test tubes aren't exact representatives of people and animals due to differences in shape and size ratio. Due to these variations, the way in which heat is lost from the test tubes will definitely be different to the actual heat loss of humans and animals. Modification: The experiment can be modified to obtain more accurate results by the following: * Carrying out each of the above experiments more number of times to order greater accuracy. * These factors could be studied together to deduce which factor has a larger affect on the rate of heat loss. For instance a beaker, which represents a short fat person, could be covered with wet tissue paper whereas a test tube representing thin tall people could be covered with dry tissue paper. Conclusion The investigation verifies our hypotheses as: * The tall thin body lost heat more quickly than the short fat body * The body wrapped in several thin layers of material lost heat more slowly than the one which was wrapped in one think layer of the material * The body with a wet surface lost heat more quickly than the one with a wet surface * The huddled together bodies did not lose heat as quickly as a single body * The body in water lost heat more quickly than the body in air ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our International Baccalaureate Biology section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related International Baccalaureate Biology essays

  1. Transpiration Investigation

    600 98.1 94.3 96.2 1344 979 1161 Table of the light intensity pressure change in tubing over time time Distance from light source= 50cm Pressure/ kPa �0.05kPa Light intensity/ lux �2lux Trial 1 Trial 2 average Trial 1 Trial 2 average 0 97.8 92.9 95.4 948 630 789 10 97.8

  2. Investigating Macromolecules and their Properties

    Place three drops of solution#1, three drops of solution#2, three drops of solution#3, three drops of solution#4, and three drops of distilled water on each separate brown paper. Leave it for few minutes. 16. Now hold the brown paper towards the light to see which of the substances make the brown paper most see-through.

  1. Should Animals have the same rights as Humans? Both animals and humans exhibit behaviours ...

    the area from which it received the food and drooling, as the table below shows: Time Distance of secondary coil in cms. Part of Skin Stimulated. Secretion of Saliva in drops during 30 secs. Motor Reaction 4:23 pm 4 usual place 6 In all cases the motor reaction displayed was

  2. Penicillin - its discovery, properties and uses.

    However, he never published his results, so no one knows how far and how long he pursued the question. But in 1884, at King's College Hospital a nurse had wounds that did not respond to any antiseptic, Lister gave another substance that cured her.

  1. Factors affecting the rate of transpiration

    will be a significant decrease in transpiration thus a reduced rate of water uptake by the leafy shoot. Variables Variables Units Range Independent The time interval minutes 2-16 Dependent The change in length of water uptake by plant cm - Controlled variables are maintained at a constant Controlled Variables Units Possible effect(s)

  2. Ecology Open Investigation Does the geographic location affect the biotic and abiotic ...

    � 1 0/00 0.00 0.00 0.00 0.00 ** 1.00 ## Nitrites NO2 � 1 mg/l 0.00 0.00 0.00 0.00 ** 1.00 Nitrates NO3 � 1 mg/l 15.00 N/A 15.00 ** 6.50 15.00 Temperature � 0.1 �C 26.70 26.70 25.40 26.40 25.50 Note: - Values shown with ** was not included

  1. Biodiversity loss

    In recent years, environmental change has been having a bigger effect on healthcare than it ever did in the past. For example, the deforestation of rainforests has disease linkages such as the avian flu and the West Nile Virus. In addition, 1 billion people who depend on local food are

  2. Finding the isotonic point for potato tissue

    With additional water, the potato cylinders gained mass. C : Between 0.32 M and 1.0 M, the potato sticks lose mass as the sucrose solution became more concentrated. The water particles leave the cells from the more dilute cell cytoplasm to the more concentrated sucrose solution by osmosis.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work