Aluminium Heat Capacities

Aluminium Heat Capacities prepareThe aim of the experimentation was to determine the specific oestrus capacities, with uncertainties, of two variant materials for the purposes of this experiment, it was chosen to be aluminiumIntroductionSpecific screw up strength is defined as the quantity of heat power, which will raise the temperature of whole mass (1kg) of a substance by 1K. It is usually denoted by c and expressed in J/(kg.K). (Joule per kilogram Kelvin).So, what is the relationship between heat and temperature?It is usually expressed Q = m c T Heat energy = mass x specific heat skill x temperature variety, (c) organism the specific heat capacity. The relationship will not happen if at that place is a phase change due to heat either creation added or removed, does not change the temperatureQ to the change of temperature T is given by Q = m c T Where Q = the change in heat energy. is the enthalpy, m = the mass c = specific heat capacity T = the change of temperature. Uni t Jkg-1K-1.High specific capacities occur in substance that contact a lot of heat energy and therefore have a long time to heat or cool down. The specific heat capacity of the sea is much greater than the land, so therefore more than heat energy will be needed to heat it up by the same amount as the land. From the relationship mass x specific thermal capacity x temperature / time = current (amps) x p.d. (volts) .The ratio temperature rise or time can be gotten from the represent slope of temperature which was plotted against time and this is how thermal capacity can be met.HypothesisCan the chosen method of investigation gravel a reliable cheer for the specific heat capacity of a admixture block?MethodApparatus Calibrated thermometerpower pack, Stop clock, VoltmeterLeads, balance wheel (up to 1kg),Ammeter, Immersion green goddess Test metalsHeat proof matt and lagThe preoccupation heater was connected to the power pack, which was set to 10V. The voltmeter and ammeter wer e set up so that they measured the potential difference and current going through the heater. Next the mass of the sample was recorded using the balance and the immersion heater was placed in the test sample, followed by the thermometer and an initial temperature reading. at the same time the power pack was turned on and the stop clock started, and the heater was left to run for two minutes prior to the first recording. Recordings were taken from the voltmeter and ammeter every minute for a total of 15 intervals. The collected entropy was gathered into a table with the following headings Following this the data was use to produce a graph of energy against temperature difference, from which the specific heat capacity can be determined.Original mass 987.8gx-axisOriginal temperature, T1 20oCY-axisTemperature, T2Temperature change, T2-T1Voltmeter, VAmmeter, ATime, sEnergy, J26611.164.151205557.6827711.184.121808291.09301011.174.1624011152.1333.513.511,164.1530013894.20371711.134.183 6016748.42402011.134.1942019586.57432311.144.2048022458.2446.526.511.134.2254025363.0449.529.511.154.2160028164.9052.532.511.154.2166030981.3955.535.511.134.2372033897.5358.538.511.124.2378036689.33624211.134.2384039547.1264.544.511.124.2490042433.9267.547.511.114.2296045008.8370.550.511.114.24102048048.53Results Table 1See graph 3 for a plot of Energy, Q against the temperature difference, T. From this graph the incline will be determined and the specific heat capacity for the metal found.Gradient of graph 3 units units Specific heat capacity of the metalunits units ConclusionThe hypothesis of Can the chosen method of investigation produce a reliable value for the specific heat capacity of a metal block? has been met ,more will be said and evaluated below.Evaluation accuracy can be improved by the method of conducting several iterations of the experiment to gather enough information to produce a mean value for the specific heat capacity. Furthermore, the temperature was recorded using a liquid in glass thermometer with an accuracy of +/- 0.5 this lead to percentage errors in the temperature readings ranging from 2.5%- from In dress to reduce these errors future experiments will be carried out using more accurate thermometer.