Latent Heat Lab Report
Activity 33
PS-2826
Latent Heat of Fusion
Thermodynamics: phase change, latent heat of fusion, melting Qty 1 1 1 1 1L 0.5 L 1 Equipment and Materials PASPORT Xplorer GLX Fast-Response Temperature Probe (included with GLX) Basic Calorimetry Set (1 calorimeter cup) Balance Water, about 15 degrees warmer than room temperature Ice, crushed Towel Part Number PS-2002 PS-2135 TD-8557 SE-8723
Purpose
The purpose of this activity is to determine the amount of thermal energy needed to change a specific quantity of ice (one gram) into water at a specific temperature (0º C). This amount of thermal energy is called the Latent Heat of Fusion of water.
Background
Just as steam has a higher internal energy than water, so water has a higher internal energy content than ice. When ice melts into water, it absorbs thermal energy from its surroundings, but does not change temperature. The absorbed energy enables water molecules in the crystalline form of ice to break free of the bonds that hold them together. The phase change from solid to liquid involves a transfer of thermal energy into the substance, but doesn’t involve a temperature change for the substance. The thermal energy, ∆Q, depends on the mass, m, and the latent heat of fusion, Hf (the amount of energy per gram needed to change phase at a specific temperature).
!Qphase change = mHf
If the substance changes from solid to liquid, and then the liquid undergoes a temperature change, the total amount of thermal energy involved is the sum of the thermal energy for the phase change and the thermal energy for the temperature change.
!Qtotal = !Qphase change + !Qtemperature change = mHf + mc!T
The thermal energy comes from the environment that surrounds the substance.
Preview
Use a Fast-Response Temperature Probe to measure the change in temperature of a known mass of water as ice changes from solid to liquid in the water. Use the Xplorer GLX to record and display the temperature. Determine the latent heat
PS-2826
Latent Heat of Fusion
Thermodynamics: phase change, latent heat of fusion, melting Qty 1 1 1 1 1L 0.5 L 1 Equipment and Materials PASPORT Xplorer GLX Fast-Response Temperature Probe (included with GLX) Basic Calorimetry Set (1 calorimeter cup) Balance Water, about 15 degrees warmer than room temperature Ice, crushed Towel Part Number PS-2002 PS-2135 TD-8557 SE-8723
Purpose
The purpose of this activity is to determine the amount of thermal energy needed to change a specific quantity of ice (one gram) into water at a specific temperature (0º C). This amount of thermal energy is called the Latent Heat of Fusion of water.
Background
Just as steam has a higher internal energy than water, so water has a higher internal energy content than ice. When ice melts into water, it absorbs thermal energy from its surroundings, but does not change temperature. The absorbed energy enables water molecules in the crystalline form of ice to break free of the bonds that hold them together. The phase change from solid to liquid involves a transfer of thermal energy into the substance, but doesn’t involve a temperature change for the substance. The thermal energy, ∆Q, depends on the mass, m, and the latent heat of fusion, Hf (the amount of energy per gram needed to change phase at a specific temperature).
!Qphase change = mHf
If the substance changes from solid to liquid, and then the liquid undergoes a temperature change, the total amount of thermal energy involved is the sum of the thermal energy for the phase change and the thermal energy for the temperature change.
!Qtotal = !Qphase change + !Qtemperature change = mHf + mc!T
The thermal energy comes from the environment that surrounds the substance.
Preview
Use a Fast-Response Temperature Probe to measure the change in temperature of a known mass of water as ice changes from solid to liquid in the water. Use the Xplorer GLX to record and display the temperature. Determine the latent heat