Specific Heat Lab
Specific heat is the property of the material that an object is made of. The greater the material's specific heat and the mass, the more energy must be added to change its temperature. The goals of this lab were to calculate the specific heat of water and compare to the known value of 4.19J/°Cg. Another goal was to calculate the efficiency of the hot pot used for the experiment and to estimate the cost to heat water for a cup of tea and to bath in a bathtub. The thermal energy E= cm Δ T, required to heat an object is equal to the mass in kg times the specific heat times the change in temperature. In this lab we will use electrically supplied energy E = P t in which p is the rate at which power is supplied and t is the time. As the temperature
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The cost to heat 1000g of water was 2cents using c equals 4.19538J/°Cg. The amount of water needed for a 150cm long by 60cm high by 60cm wide bath tub water calculated to 540,000ml. The energy needed to heat 540,000mL of water was 113,130,000J and the cost to heat 540,000mL of water for a bathtub was calculated to be $6.29. The cost seemed a little high may be because the bathtub was filled to the top. Our value of calculated specific heat of 4.38J/°Cg was really close to the known value of 4.19J/°Cg therefore our results were accurate. Looking at the % error it can be said that our data was precise because the % error was only 4.5% which might be due to loss of heat because the efficiency of the hot pot was not 100%. Our prediction about the value of power was true that as the temperature went higher the power became stationary by looking at table 1. Possible improvement to this lab could be to use a 1000mL beaker rather than using a 400mL beaker a few times because using a beaker a few times could be the reason for a possible error. We might have spilled water out on the way back. Another improvement could be to use a hot pot with 99.9% efficiency because this pot did not have a 100% efficiency that played a role in the % error of the experiment. Overall, this experiment was really helpful to understand some things related to our life. This
The cost to heat 1000g of water was 2cents using c equals 4.19538J/°Cg. The amount of water needed for a 150cm long by 60cm high by 60cm wide bath tub water calculated to 540,000ml. The energy needed to heat 540,000mL of water was 113,130,000J and the cost to heat 540,000mL of water for a bathtub was calculated to be $6.29. The cost seemed a little high may be because the bathtub was filled to the top. Our value of calculated specific heat of 4.38J/°Cg was really close to the known value of 4.19J/°Cg therefore our results were accurate. Looking at the % error it can be said that our data was precise because the % error was only 4.5% which might be due to loss of heat because the efficiency of the hot pot was not 100%. Our prediction about the value of power was true that as the temperature went higher the power became stationary by looking at table 1. Possible improvement to this lab could be to use a 1000mL beaker rather than using a 400mL beaker a few times because using a beaker a few times could be the reason for a possible error. We might have spilled water out on the way back. Another improvement could be to use a hot pot with 99.9% efficiency because this pot did not have a 100% efficiency that played a role in the % error of the experiment. Overall, this experiment was really helpful to understand some things related to our life. This