Biology Coursework Practical – Heat Loss The aim of this practical is to find to what extent does the surface area to volume ratio of an object affect the rate of heat loss from the object Hypothesis: As the ratio of surface area to volume of an object decreases the rate of heat loss from the object will also decrease. Objects with the same surface area to volume ratios loose heat at the same rate so long as there are not other variables involved. Background Knowledge: The surface area to volume ratio of an object is determined by dividing the surface area by the volume and putting it into a ratio of one. e.g. A flask of volume 200cm3 and a surface area of 160cm2 will have a surface area to volume ratio of: 160 ---- : 1 = 1.25 : 1 200 Objects that are not the same size but have the same surface area to volume ratios loose heat at the same rate. So a flask, with a volume of 200cm3 with a surface area of 160cm2 and a surface area to volume ratio of 1.25:1, will loose heat at the same rate as a similar flask of volume 625 and a surface area of 500 which also has a surface area to volume ratio of 1.25:1. However, generally when you increase the size of an object the surface area to volume ratio decreases so in this example it is very likely that the two flasks in question are different shapes. In this experiment the two flasks which will be used will different surface area to volume ratios as follows: 100 cm3 flask: Volume = 100, Surface Area = 115. Surface Area to Volume Ratio = 115 ---- : 1 = 1.15 : 1 100 500 cm3 flask: Volume = 500, Surface area = 330. Surface Area to Volume Ratio = 330 ---- : 1 = 0.66 : 1 500 As it is seen the ratio is lower in the 500 cm3 flask. This means that the rate of heat loss should be less than the 100 cm3 flask. Heat is lost by three different processes: * Conduction * Convection * Radiation.. Conduction is the process by which heat is transferred from on solid to another. When a solid is heated the molecules inside, which are normally almost static, start to vibrate. When another solid is brought into contact with the heated solid the energy from the vibrating molecules at the edge of the heated solid is transferred to the outer molecules of the other solid.
Sionek, I 2015, “Lab Report Surface Area to Volume Ration Effect on Diffusion”, URLhttp://www.academia.edu/8366188/Lab_Report_Surface_area_to_volume_ratio_effect_on_diffusion accessed 6th April
on how long it takes to heat up. If we heat a large volume of water it
As the gelatin cube sizes were cut into smaller pieces, the surface area to volume ratio increases. Surface area to volume ration is very important in living organisms, since all the nutrients and oxygen need to diffuse through the cell membrane into the cells. The surface area to volume ratio affects the rate in which the salt diffused through the solution by how the salt diffused out of the gelatin and into the water this relates to small cells that have a faster rate of diffusion for the nutrients and oxygen to diffuse into the cell and out of the cell quicker. Whereas if the cells were bigger, the rate of diffusion for the nutrients and oxygen to diffuse into the cell would take too long and the cell would probably not survive. So the surface area to volume ratio in cells is vital since the smaller they are the faster the rate of diffusion of the nutrients and oxygen can go in and out for the cell to be able to grow and survive.
The total volume of all the liquids will be kept the same. As will the
“Boyle’s law states that provided temperature is constant, the volume of a given amount of gas will vary inversely with the pressure in the container.”
The flask was then taken back to the first lab bench and placed under the buret with sodium hydroxide. The initial volume of the base in the buret was
solution placed in each flask to make it a fair test , I will also
The porpoise of these is to determine the Specific Heat. Also known as Heat Capacity, the specific heat is the amount of the Heat Per Unit mass required to raise the temperature by one degree Celsius. The relationship between heat and temperature changed is usually expected in the form shown. The relationship does not apply if a phase change is encountered because the heat added or removed during a phase change does not change the temperature.
The units are grams for the mass, centimeters cubed for the volume and grams/ centimeters cubed for the density. For the sphere, the mass was 242.4 g and the volume was 47.7 cm^3, which makes the density of 5.08 g/cm^3. For the cylinder, the mass was 103.2 g and the volume was 34.3 cm^3, which makes the density of 3 g/cm^3. For the first rock, the mass was 334.1 g and the volume was 118 cm^3 which makes the density of 2.83 g/cm^3. For the second rock, the mass was 46.6 g and the volume was 20 cm^3, which makes the density of 2.33 g/cm^3. For the water, the density will always be 1 g/cm^3 which means the mass and volume will always be the exact same number.
The purpose was to crest five separate layers of colored sugar water. The concept of the lab is to find the density of the colored sugar water by dividing mass over volume. Mass is a measure of the amount of matter in an object. Volume is the quantity of 3 dimensional space occupied by a liquid, solid or gas. Density is the measurement of an object's mass per unit of volume. The lab was setup to study the concept on how to calculate the density by mass divided by volume. The independent variable is the mass of the sugar. The dependent variable is the density of the sugar H2O. The constant variable is the volume of the H2O.
The base unit for volume is m3, however in the experiment this unit too big so cm3 was used because the burette is measured in
The data from the first experiment demonstrated that when the temperature is held at a constant and the pressure increases, then the volume will decrease. The data collected from the experiment are shown in figure1.
Determining the density of each sample required measuring the mass of the two stoppers (black and brown) on a top loader electronic balance. The black stopper mass was 6.84g, while the mass for the brown stopper was 0.36g. Volume is determined by two different methods (volume by length and volume by displacement) in order to illustrate the precision of the data. Volume by length general formula is given as V= π*r^2*h (where r-Radius-Height, and v-Volume), In order to get the exact radius value for each of the stoppers, the Vernier caliper is used to measure the diameter, which is then divided by ...
When we place two objects with different temperatures in contact with each other, the heat from the hotter object will immediately and automatically flow to the colder object. This is known as conduction. Some objects make excellent conductors of heat while others make poor conductors of heat or excellent insulators. Silver, copper, and gold make excellent conductors of heat. Foams and plastics make good insulators of heat but make poor conductors. Last night for dinner, I made myself a grilled cheese sandwich and a bowl of tomato soup. I heated the soup faster than I cooked the sandwich so I poured the hot soup into a bowl and finished cooking the sandwich. Once I was done cooking, I gabbed the soup bowl and burned my hand. The heat from the soup made the bowl hot. This is an example of conduction.
3 Temperature is defined as the measure of the average kinetic energy of the particles of a substance. It is not a form of energy but a means of energy transfer. And since it is an average of the heat or energy therefore the number of particles inside and size of the item don’t matter. It is the physical property emphasizing hot and cold. Generally an object that feels hot will have a high temperature. Or if an object feels warmer to the touch then it’s known that it has to be warmer than body temperature. But other than touch, thermometers are com...