Heat as a Measurable Quantity :Heat as a Measurable Quantity Investigation Three Tony Verde


Journal :Journal Do you think the ability to absorb heat can be measured?


Historically, heat was measured in terms of the ability to raise the temperature of water. :Historically, heat was measured in terms of the ability to raise the temperature of water. James Prescott Joule - calculated the amount of electrical work needed to produce a unit of heat. The term joule (J) became the SI unit(International System of Units) when measuring units of specific heat capacity


Measuring the ability to absorb heat as a physical property of matter :Measuring the ability to absorb heat as a physical property of matter Specific heat capacity is a measure of heat energy The amount of heat energy in joules required to raise or lower the temperature 1 C of 1 gram of substance.


specific heat capacity :specific heat capacity Heat Unit:One "calorie" (cal) = 4.186 Joules SPC for water is 1 cal or 4.186 J 1 gram of substance is about the size of an unchewed Plastic Bic pen cap


Calculating the specific heat capacity of a substance :Calculating the specific heat capacity of a substance SPC = Heat energy gained by water (J) (mass of solid (g) x change in temp of solid(C)


Why do cooking pans have wooden handles? :Why do cooking pans have wooden handles? SPC for wood = 1.76 SPC for Alum = .0906 Wood has a higher SPC therefore a greater amount of heat is need to increase its temp. making it safer to use than metal handles The inverse is true the lower the SPC the hotter a substance gets when heated


Specific Heats of Some Common Substances :Specific Heats of Some Common Substances General Rule #1 - The greater the specific heat value, the less the temperature will rise when a given heat energy is absorbed. Which one stays hot longer after removal from the bath?


Which one stays hot longer after being removed? :Which one stays hot longer after being removed? Assume equal masses and heat losses. Specific Heat Capacity of Glass Marble      0.86 Aluminum       0.902 Copper       0.385 Copper


Food calories are in kilocalories. :Food calories are in kilocalories. Heat Unit: One "calorie" (cal) = 4.186 Joules


Calorimeter :Calorimeter used to measure the heat of a reaction.  It measures energy changes using an isolated system, a thermometer and a known mass of water.  The simplest calorimeter is just two Styrofoam cups with a lid.


How a Calorimeter works: :How a Calorimeter works: The isolated system does not allow energy to pass in or out.  Therefore, all of the energy from the physical or chemical change, gets absorbed or the released by the water.


Law of Conservation of Energy :Law of Conservation of Energy States that energy cannot be created or destroyed, but can change its form. Energy does not simply appear and disappear.  Energy is transferred from one position to another or transformed from one type of energy to another