Factors Affecting Heat Loss.
Science Investigation Factors Affecting Heat Loss Introduction: There are three main types of heat transfer, Convection, conduction and radiation. We are asked to do and experiment heat loss using one of the heat transfer. Our group chosen to do radiation because it would be a straight forward experiment and I understood the task of the experiment. We will be using Aluminium foil, both the shiny and matt sides, white colour paper, black colour paper and corrugated cardboard. Radiation: The hotter the object is the more heat energy it radiates. Different surfaces affect radiation. It depends an awful lot on surface colour and texture. Dark matt materials absorb the radiation falling on them. Much more strongly than bright glossy surfaces such as gloss white or silver. They also emit heat radiation much more to. Silvered surfaces reflect almost all heat radiation falling on them. Dark matt materials are poor reflectors and light surfaces are poor absorbers. Conduction: Conduction of heat occurs mainly in solids. Conduction of the heat is the process where vibrating particles pass on the extra vibration and energy to the neighbouring particles. This process continues through out the solids, causing a rising temperature at the other side. Non-metals such as plastic, wood and rubber etc are very good insulators. All metals are good conductors due to their free electrons.
Heat loss from animals
Saira Hamid 1CM 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. Just like the polar bear other animals such as the camel have had to adapt to live in the desert conditions so therefore it needs to increase the amount of heat loss. Both these animals have had to adapt to the environment that they live
Investigate the effect of huddling on heat loss.
Huddle investigation PLANNING A Aim: to investigate the effect of huddling on heat loss Hypotheses: . That the larger the huddle, the smaller the amount of heat lost. That is, an organism (test tube) on its own will lose more heat than if it were huddled in a group. In an experiment using test tubes, this will be supported by data which shows that a test tube by itself will lose more heat in the same amount of time than if it were in a huddle. 2. The temperature loss should decrease proportionally as the size of the huddle grows. 3. Also, the organism (test tube) in the centre of the huddle will lose less heat than an organism or test tube on the outside of the huddle. The reasoning behind this hypothesis is that as the huddle group grows in size, the amount of exposed 'surface area' will be reduced per test tube. Although in practice not every test tube is exposed, theoretically, this is a way of comparing huddles. Also, in a huddle of many organisms, or test tubes, if there is a centre test tube which is not 'exposed', it will be warmer than those on the periphery of the huddle. This hypothesis can be supported by data collected in the experiment by measuring the temperature of the centre of the huddle and the periphery of the huddle. The centre will be warmer because it has no surface area exposed to the outside. Huddling is a behavioural adaptation
Factors Affecting Health
Factors Affecting Health and Well-Being Many factors combine together to affect the health and well-being of individuals and communities. Whether people are healthy or not is determined by their circumstances and environment. To a large extent, factors such as where we live, the state of our environment, genetics, our income and education level, and our relationships with friends and family all have considerable impacts on health and well-being, whereas the more commonly considered factors such as access and use of health care services often have less of an impact. Thus the context of people's lives determines their health, and so blaming individuals for having poor health or crediting them for good health is inappropriate. Individuals are unlikely to be able to directly control many of the determinants of health. Lifestyle Choices A lifestyle choice is the view that people are free to choose their way of life. For example, people may be free to choose a healthy diet, a healthy balance of rest and exercise and healthy habits such as only moderate drinking of alcohol and not smoking. Some of the choices that individuals make that affect their health and well-being is: Smoking There are not many smokers about who started smoking after the age of eighteen. In fact, the majority of smokers took up the habit in their early or mid teens. At such a young age, they don't
Investigating Factors Affecting the Rate of Photosynthesis.
AT2 Biology Investigating Factors Affecting the Rate of Photosynthesis Stella Boachie How does Light Intensity Affect the Rate of Photosynthesis? Aim The aim of this coursework is to investigate whether light intensity affects the rate of photosynthesis. To do this, I will place a piece of Canadian pondweed in varying light intensities and observe the amount of oxygen given off. Introduction Photosynthesis is the process by which green plants and certain other organisms transform light into chemical energy. In green plants, light energy is captured by chlorophyll in the chloroplasts found in the palisade cells of the leaves and used to concert water, carbon dioxide and minerals into oxygen and energy rich organic compounds (sugar) that are the basis of both plants and animal life. The first step in photosynthesis is Light Dependent Processes (Light Reaction). Light strikes chlorophyll in such a way as to excite electrons to a higher energy state. In a series of reaction, the energy is converted along an electron transport process into ATP (adenosine triphosphate) and NADPH (nicotinamide adenine dinucleotide phosphate). Water is split in the process, releasing oxygen as a by-product of the reaction. The ATP and NADPH are used to make C-C bonds in the next stage of photosynthesis, Light Independent Process (Dark Reaction). In the Light Independent Process, carbon
An investigation into the factors affecting the temperature rise of water heated electrically.
An Investigation Into the Factors Affecting The Temperature Rise of Water Heated Electrically Planning Aim: The aim of this investigation is to determine the factors affecting the temperature rise of water which is being heated electrically. Variables: The variables in this experiment are: ) Time 2) The Power Of The Heater 3) The Mass Of Water 4) The Temperature Rise The Possible Experiments There are several experiments which can be carried out to investigate the factors affecting water being heated electrically. ) Varying the mass of water used and the temperature rise and keeping the power of the heater and the time fixed. In this experiment the mass of water would be varied and keeping the power of the heater the same, the temperature rise could be record to produce an array of results. 2) Varying the power of the heater and the temperature rise, and keeping the mass of water and the time taken fixed. In this experiment the power of the heater would be varied and he again the temperature rise would be record to take results. 3) Finally the time could be varied with the temperature rise being varied, keeping the power and mass constant. In this experiment the time the heater was left on would be varied and the temperature rise would be recorded. From these 3 I have decided to choose 1) because number 3 is trivial, it is too simple and will not tell me
An investigation into the factors affecting osmosis
Planning My aim for this experiment is to see the results of potato tissue's mass difference, when placed in different concentrations of sugar solutions. Variables involved: For this experiment I would expect to have 3 different variables, Independent, Dependent, and fixed variables, which all helps me to plan and explain the experiment thoroughly. The Independent variable (things you change), the thing that I will be changing in this investigation into the factors affecting osmosis, is the concentrations of the solution that helps me to investigate osmosis with potato tissues. The different sugar concentrations will be changed to see the result of the potatoes when placed in sugar solutions placed in different molarities (strengths). Dependent Variable (things that you measure) the things that I'll be measuring in this experiment on osmosis is the mass change and length change of the potatoes placed in different molarities of sugar solutions. I will record the masses in grams by using a balance and the length changes by using a ruler. Fixed Variables (Things that you keep the same) the things that I have chosen to keep the same in each individual experiment to keep it a fair test is to keep the same sizes of each potato tissue the same by using the same cork borer and same ruler. I will be keeping the same amount of solution placed in the test tubes for each different
The factors affecting the resistance of a metalic conductor.
INVESTIGATION: THE FACTORS AFFECTING THE RESISTANCE OF A METALLIC CONDUCTOR Metals conduct electricity because the electrons in the metal can move about inside the structure. These electrons are called free electrons. Electricity is conducted through a conductor by means of free electrons. Atoms consist of protons, electrons and neutrons. The protons and neutrons make the nucleus of an atom while the electrons circle the outer area of the atom. Electrons in metal are able to move freely and are used as current in an electric circuit. This is because they carry a charge and can move all around the circuit with this charge. While these electrons are travelling around the circuit, atoms are sometimes in the way, causing the two to collide. This takes out some of the energy from the electron and transfers it to the atom. This is how resistance occurs. The number of free electrons depends on the material and the more the free electrons in a substance the better the material as a conductor. All conductors offer resistance to the flow of current. The conductor's atoms determine this resistance. For example copper atoms offer negligible resistance to an electric current because a significant proportion of its electrons are free to move from electron to electron. Thus copper is commonly used as a conductor. Current, is the flow of electrons around a circuit. Those materials,
To measure heat loss in two test tubes which represent bodies, one which sweats (the wet test tube) and one body which doesn't sweat (the dry test tube).
Biology Coursework: Sweaty Bodies Aim: To measure heat loss in two test tubes which represent bodies, one which sweats (the wet test tube) and one body which doesn't sweat (the dry test tube). Apparatus: 2 Thermometers 2 Stoppers 2 Boiling Tubes 2 Measuring Cylinders Cotton Wool Paper Towels Timer Water Previous Knowledge: I know that when the body gets to hot, the sweat glands produce sweat, which evaporates of the skins surface, and cools the body as it evaporates. The evaporation of water needs a lot of heat energy. This heat energy is taken from the body when the sweat evaporates. Prediction: I think that the wet test tube will cool the fastest because this is what happened during my preliminary experiment. The wet test tube cooled the water down by 22OC more than the dry test tube. Also my knowledge of the way the human body works helps support my prediction because the body produces sweat to cool the body down, and the wet test tube acts in the same way. Diagram: Fair Testing: For all the experiments I'm going to conduct I will have to make sure I do them fairly. I will use exactly the same apparatus, the same amount of water in each test tube as well as the same amount of paper towelling each time. I will measure the temperature change in each test tube for the same amount of time and will begin measuring the temperature when the temperature in each
An Experiment Investigating the Factors Affecting Photosynthesis in Canadian Pondweed
An Experiment Investigating the Factors Affecting Photosynthesis in Canadian Pondweed The experiment I am going to investigate involves exploring the effect certain limiting factors have on the rate of photosynthesis in Canadian pondweed. The formula for photosynthesis is as follows: 6CO2 + 6H2O = 6O2 + C6H12O6 Photosynthesis is the process in which green plants make use of the energy in sunlight to manufacture carbohydrates from carbon dioxide and water in the presence of chlorophyll. Water is absorbed by the roots and carried to the leaves by xylem tubes, and carbon dioxide is obtained from the air through the stomata and diffuses into the cells containing chlorophyll. Chlorophyll is a green pigment that is capable of converting sunlight energy into a latent form, stored in the plants food. Preliminary Work I am going to do this preliminary work so that I can find the boundaries for my experiment by finding the conditions needed for my experiment to work. There are three main limiting factors that could affect the rate of photosynthesis in my pondweed. These are: * CO2 levels - to adjust the amount of CO2 in the water I am using for my experiment I can add bicarbonate of soda. This will dissolve in the water and increase the amount of CO2 available for the plant to use during photosynthesis. * Light levels - these can be changed by the distance or strength of the
