• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month
Page
  1. 1
    1
  2. 2
    2
  3. 3
    3
  4. 4
    4
  5. 5
    5
  6. 6
    6
  7. 7
    7
  8. 8
    8
  9. 9
    9

You are taking a group of people to the arctic. Design an experiment, which will enable you to choose the best lining material for jackets to wear.

Extracts from this document...

Introduction

INVESTIGATION: You are taking a group of people to the arctic. Design an experiment, which will enable you to choose the best lining material for jackets to wear. BACKGROUND KNOWLEDGE: The environment of a living organism is always changing. Think about your own environment. The temperature of the air around you changes e.g. it can be -10oc outside and 23oc indoors. The cells inside your body, however, do not have to put up with a changing environment. Your body keeps the environment inside your body almost the same all the time. This is called homeostasis. This is very important. It helps your cells to work as efficiently as possible. When your body drops below 37oc, messages from the hypothalamus cause your skin to cut down the rate of heat loss. Firstly your hairs stand on end, which on an animal is very effective as lots of air pockets are formed, but this is not as effective for humans. Secondly the capillaries narrow, minimizing heat loss. Also you may start to shiver which is just a faint contraction and relaxation of muscles. Animals living in very cold temperatures survive by moving very little or not at all. Cold temperatures in poikilothermic animals slow down chemical reactions therefore slowing down the activity of the organism. The size or surface area of an animal or beaker does make a difference. The larger the surface area the more heat that will be lost. ...read more.

Middle

Out of the three materials that I chose to investigate I think that cotton wool will be the best at reducing the heat loss. I am saying this because inside cotton wool there are many small pockets of trapped air, and air is a very good insulator in small pockets. I also am suggesting that the control experiment will be the worst because there is no insulation protecting it. APPARATUS: test tube rack 8 test tubes material 8 thermometers stop clock kettle Elastic bands METHOD: I will boil some water from the kettle then pour some water from the kettle into each test tube that has been wrapped in the certain material. A thermometer shall be placed into each test tube and the temperature recorded at the beginning of the experiment. I will record the temperature every 5 minutes over a 30-minute period. To make my results reliable I will use a control and test everything I do twice to get an accurate average result. SAFETY: Safety precautions are needed because I am dealing with hot water, which can scald. The following things need to be acknowledged to, in order to keep this experiment safe: Time-minutes Control Bubble wrap Cotton Wool 1 2 A D 1 2 A D 1 2 A D 1 2 A D 0 5 10 15 20 25 30 � Be careful not to knock over the vessel with the hot water in � Be careful not to knock over other peoples vessels � Care is needed when pouring hot water � Do ...read more.

Conclusion

EVALUATION: I feel that the experiment I carried out was not as fair as I would have liked it to be. I could have had the temperatures at the start all-equal; I could have measured my volumes more accurately and used more precise amounts of material on the test tubes to make the test fairer. I also feel that I could have made my readings more accurate and take a larger amount of timings for more results. I feel the experiment would have been improved if I had done all these things very precisely and maybe I would have slightly better results. Even though my experiment was not exactly the best my prediction still matched my results in the end, that the wool was the best then cotton then bubble wrap then the control. I do feel that I can conclusively say that wool would be the best lining for a jacket to keep someone warm in the arctic because it traps pockets of air creating warmth. I did find some strange results in my results. This may be down to the impreciseness of my work. In the cotton experiment the temperatures of my first test and second test were the same. I feel that this was my most precise experiment. I have designed an experiment and carried it out. I have obtained results, plotted them on a graph and explained what I have found. I have finally concluded that I will use wool in the lining of my jacket. ...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. In this investigation I will investigate heat loss and heat transfer in different materials ...

    I will do this by making sure that the insulation only goes round exactly once. I will also use a stopwatch so I can be accurate see when I need to record another temperature reading. Safety Precautions I will need to use safety precautions in this experiment as I am dealing with hot water which can cause harm if misused.

  2. Discover which insulating material is the most efficient for keeping warm.

    The amount of water used inside the beakers. This is because, if there is more water, heat convection will take longer to even out, therefore staying warmer than if there was only 50ml of water. 2. The beginning temperature of the water (55�C).

  1. Is photorespiration an effective mechanism for protecting against photoinhibition?

    (Sharkey 1988). The conclusion was that glycollate metabolism gave rise to photorespiratory CO2. Questions still surrounded the elements contained within the pathway, particularly "where doe the glycollate come from" clearly it must be involved in a carbon assimilatory pathway otherwise it would not have shown up in the 14CO2 pathway.

  2. Find out what insulator is the best from cotton wool, bubble wrap and plastic ...

    Therefore, conduction or radiation cannot take place. This can not take place because air is trapped into the pockets. The next insulator I think will be good is plastic foam. This is because plastic foam is made from sponge and it has many pores.

  1. Discuss the various adaptations of vertebrates that enable them to live in marine conditions.

    Flow is said to be laminar. The next form of drag is pressure drag. This is created as the object moves through the water and suction is caused as the water flows back into the gap the object has displaced, disrupting the boundary layer (backfill).

  2. Experiment Report on Best Fertilisers

    period, and to record nutrients and water levels left in the plants every Week, to determine which fertilizer is the best. Hypothesis- I believe that the Osmocote granule fertilizer will perform the best for this experiment as it is tree seed specific, plus it has the longest release period of

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