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

Investigation into the U-Values of Different Materials.

Extracts from this document...

Introduction

Investigation into the U-Values of Different Materials Planning experimental procedures AIM: The aim of this investigation is to compare the U-values given off by conductors of different materials. The U-value for any specified heat conductor is the heat energy lost per second through the conductor per square metre when there is a temperature difference of 1�c between its surfaces. FAIR TEST: * I must have equal amounts of water in each container. - This ensures the same amount of water will be heated up. To do this I will need to measure each one accurately. * I must make sure each material covers the same surface of the metal container.- This ensures the 'temperature given off' is carried out fairly. * I must start measuring the temperature of each container at the same time. - This means the starting temperature will be the same so that each experiment begins fairly. * I must place the thermometer just outside the containers. - This ensures I am reading the temperature of what is being given off and NOT the outside temperature. EQUIPMENT: 1. Water 2. Conducting Materials : -Artificial fur -Foil (aluminium) -Cotton wool (with cello tape) -Carpet -Copper Calorimeter on its own 3. Copper Calorimeter X 4 4. Thermometer 5. Stop-clock 6. ...read more.

Middle

In addition, I will not use the voltage and amperage as I know it is not necessary in this experiment from the textbook. (Look at graph please) Obtaining evidence This experiment is about which different materials out of the previously mentioned indicators are the best and worst insulator (material that traps in heat). I will find this out by working out the U-values for each indicator. I will need to keep the same amount of water in each calorimeter. This ensures that the mass therefore the whole experiment will not be affected. I will need to place the thermometers in the same positions every time. This ensures I am reading the energy being lost and NOT the outside room temperature. DIAGRAM OF EXPERIMENT I have collected my results (see TABLE OF RESULTS please) from the above experiment and calculated the U-values using the following formulas. 1. Formula to calculate 'Energy Lost': 2. Formula to calculate 'Rate of Energy Lost': 3. Formula to calculate 'U-Value' U-Value = Table of Answers Energy Lost (J) Rate of Energy Lost (secs) U-Value Cotton 15726.942 17.47438 8.4 Carpet 17772.72 19.74746666 11.1 Copper 27354.7008 30.39412 18.5 Fur 17898.804 19.88756 7.6 Foil 25221.042 28.02338 21.4 *Lowest U-value highlighted in green *Highest U-value highlighted in red Analysing Evidence and Drawing Conclusions This line graph shows that the copper on its own had the heat inside reduce the most. ...read more.

Conclusion

As for the cotton wool, being a better insulator than the carpet could be due to the fact the carpet was not properly covered over the whole of the calorimeter. This in effect would mean heat energy could escape through the exposed part quicker. In addition to this, the cello tape on the cotton wool indicator could have trapped air bubbles. These air bubbles have trapped hot air, which would improve the insulation of the cotton wool indicator. OTHER EXPERIMENTS If I had enough time, I would find the specific heat capacity for each calorimeter. This would improve the accuracy of my results when using the formulas. Hina Moazzam 11:1 TABLE OF RESULTS Time (min) Cotton Carpet Copper Fur Foil 0 83 88 88 90 88 1 93 86.5 88.5 92 90 2 92 85.5 86 90.5 89 3 91 85 84.5 89.5 87.5 4 90 84 82.5 88.5 86 5 89.5 83.5 81 87 85 6 89 83 79.5 86.2 83.5 7 88 82 78.5 85.5 82.5 8 87.5 81.8 77 84.5 81.6 9 86.5 81 75.8 83.5 81.2 10 86 80.5 74.5 82.7 79.5 11 85 80 73 82 78.5 12 84.5 79.5 72 81 77.5 13 84 79 71 80.5 76.5 14 83 78.5 70 79.6 75.5 15 82.5 78 68.8 79 74.5 ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Green Plants as Organisms 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 GCSE Green Plants as Organisms essays

  1. Marked by a teacher

    AN INVESTIGATION OF THE DIFFERENT SPECIES OF MAYFLY WITHIN THE POOL & RIFFLE

    4 star(s)

    That is probably because the species are not specially adapted to live in the riffle. There are more Gammarus in the pool than in the riffle, which might have something to do with the flow of water in both riffle and pool.

  2. My investigation is to find out the rate of which heat transfer happens. Heat ...

    As this will make it harder for conduction to take place as the material/ container is thicker.

  1. The investigation is aiming to look at transpiration.

    bag 5 0.3 0.3 1.0 0.8 0.7+0.5/2 =0.6 0.6/5 = 0.12 Radiator 5 1.3 1.0 2.1 2.0 0.8+1.0/2 = 0.9 0.9/5 = 0.18 Blocking with Vaseline 5 0.5 0.0 1.0 0.6 0.5+0.6/2 = 0.55 0.55/5 = 0.11 Cutting of leaves 5 2.9 0.0 3.7 0.5 0.8+0.5 =0.65 0.65/5 = 0.13

  2. In this investigation I will investigate heat loss and heat transfer in different materials ...

    for each test so I will have two tests measuring the rate of heat loss of 150 ml of water, and 100ml of water each using either black paper or tin foil for insulation. I will also use the same starting temperature for each test.

  1. An Investigation into Species Diversity with distance along a Pingo.

    They add nitrate to the soil as they excrete which decomposes to form ammonium in the soil. The process of nitrogen fixation by rhizobium, lightning, free living bacteria in the soil convert nitrogen in the air into organic nitrogen in the soil, which decomposes to ammonium.

  2. Determine which materials make the best insulators and determine the factors affecting heat loss ...

    You can feel the coding effect if you put a drop of a liquid on your skin that evaporates easily. * Variables to Test / Hypothesis: - Wool: The more wool around the container the better the insulator it would be; the amount of wool can make a difference in

  1. Extracting copper from its ore

    Note: the slurry contains the gold particles, which are maintained within a matrix of minerals.

  2. I am investigating the rate at which heat energy is lost and heat transfer ...

    Before carrying out the experiment, certain factors need to be taken into consideration as they can make a significant difference to the experiment. The factors that need to be considered are: � The volume of water in the beaker. When the volume of water in the beaker is higher, it

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