# Engineering Lab report 4- Specific Heat capacity.docx -...

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AbstractThis experiment is to identify the specific heat capacity of the calorimeter, metals andunknown metals, to compare the measured value and theoretical value and to identify thematerial of the unknown metals. In this experiment, four materials will be used which isaluminium metal, brass metal, unknown metal 1 and unknown metal 2. At the end of theexperiment, unknown metal 1 is identified as mild steel and unknown metal 2 as stainlesssteel 304. Aluminium metal will have the greatest percentage error, (64%) in term of specificheat capacity of the metals and unknown metals while brass metal haves the least percentageerror, (18.65%) among the metals and unknown metals.IntroductionHeat is transfer by conduction occurs when an object with high thermal energy comesinto contact with an object with low thermal energy. Heat transfer by convection occursthrough a medium. For example, when heat transfers from the hot water at the bottom of thepot to the cooler water at the top of the pot. Lastly, heat can also be transferred by radiation; ahot object can convey heat to anything in its surroundings via electromagnetic radiation.When a high temperature body is brought into contact with a low temperature body,the temperatures equilibrate: there is heat flow from higher to lower temperature, like waterflowing downhill, until the temperatures of the bodies are equivalent. The high temperaturebody loses thermal energy, and the low temperature body acquires this same amount ofthermal energy. The system is then said to be at thermal equilibrium (lumen, n.d.).The specific heat is the amount ofheatper unit mass required to raise thetemperatureby one degree Celsius. The relationship between heat and temperature change is usuallyexpressed in the form shown below where c is the specific heat. The relationship does notapply if aphase changeis encountered, because the heat added or removed during a phasechange does not change the temperature. The specific heat of water is 1 calorie/gram °C =4.186 joule/gram °C which is higher than any other common substance (R.Nave, n.d.).Q= mCsΔT(Equation 1)Where;Q is the amount of heat released or gained by an objectCs is the specific heat capacityM is the mass of the objectΔT is the change in temperature
In this experiment the calorimeter, the specific heat capacities of two differentunknown metals will be determine by observing the transfer of heat from a heated piece ofmetal to a sample of water at room temperature (Dr. Chan, n.d.)Heat lost by hot water = heat gained by cold water +heat gained by calorimeter.-q hot=q cold +q cal(Equation 2)The minus sign indicates that the hot water is losing, whereas the cold water and thecalorimeter are gaining heat. From the amount of water in the calorimeter and thetemperature change undergone by the water, the quantity of heat absorbed by the calorimeter,q cal, can be determined. The heat capacity of the calorimeter, C cal, is determined bydividing q cal by the temperature change (Anon, 2015). Figure 1 shows the heat capacity test

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