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& Latent Heats
Specific Heat Capacity (heat capacity, thermal capacity)
Specific Heat Capacity (heat capacity, thermal capacity)
A physical property of matter, defined as the amount of heat (thermal energy) to be supplied to a given mass of a material to produce a unit change in its temperature.
A physical property of matter, defined as the amount of heat (thermal energy) to be supplied to a given mass of a material to produce a unit change in its temperature.
Mechanical equivalent of heat
Mechanical equivalent of heat
The mechanical equivalent of heat states that motion and heat are mutually interchangeable and that in every case, a given amount of work would generate the same amount of heat, provided the work done is totally converted to heat energy.
The mechanical equivalent of heat states that motion and heat are mutually interchangeable and that in every case, a given amount of work would generate the same amount of heat, provided the work done is totally converted to heat energy.
Benjamin Thompson, Count Rumford, had observed the frictional heat generated by boring cannon at the arsenal in Munich, Germany in 1797.
Benjamin Thompson, Count Rumford, had observed the frictional heat generated by boring cannon at the arsenal in Munich, Germany in 1797.
Do problem #17 on the Thermal Physics packet
Do problem #17 on the Thermal Physics packet
Joule's apparatus for measuring the mechanical equivalent of heat in which the "work" of the falling weight is converted into the "heat" of agitation in the water.
Phase Changes & Latent Heat
Phase Changes & Latent Heat
Latent Heat
Latent Heat
The heat required to convert a solid into a liquid or vapor, or a liquid into a vapor, without change of temperature.
The heat required to convert a solid into a liquid or vapor, or a liquid into a vapor, without change of temperature.
Practice Problems
Practice Problems
CALCULATE FINAL TEMPERATURE FROM PHASE CHANGE: COOLING SODA WITH ICE CUBES
CALCULATE FINAL TEMPERATURE FROM PHASE CHANGE: COOLING SODA WITH ICE CUBES
Three ice cubes are used to chill a soda at 20ºC with mass m(soda)=0.25 kg. The ice is at 0ºC and each ice cube has a mass of 6.0 g. Assume that the soda is kept in a foam container so that heat loss can be ignored. Assume the soda has the same heat capacity as water. Find the final temperature when all ice has melted.
Three ice cubes are used to chill a soda at 20ºC with mass m(soda)=0.25 kg. The ice is at 0ºC and each ice cube has a mass of 6.0 g. Assume that the soda is kept in a foam container so that heat loss can be ignored. Assume the soda has the same heat capacity as water. Find the final temperature when all ice has melted.
CALCULATING THE ENERGY NEEDED TO CHANGE ICE TO WATER VAPOR
CALCULATING THE ENERGY NEEDED TO CHANGE ICE TO WATER VAPOR
A forth ice cube, like the one above, had fallen on the counter. Instead of throwing it in the sink you decided to fry it in a frying pan. How much energy would it take to vaporize a 6.0 g ice cube?
A forth ice cube, like the one above, had fallen on the counter. Instead of throwing it in the sink you decided to fry it in a frying pan. How much energy would it take to vaporize a 6.0 g ice cube?
Specific heat for ice 2.1 kJ/kg K
heat of fusion for ice/water at 0 °C is approximately 334 KJ/ kg
Specific heat for water 4.18 kJ/kg K
heat of vaporization for water/vapor at 100 °C is about 2265 KJ/kg
Specific heat for water/vapor 1.996 kJ/kg K
States of Matter
States of Matter
Watch different types of molecules form a solid, liquid, or gas. Add or remove heat and watch the phase change. Change the temperature or volume of a container and see a pressure-temperature diagram respond in real time. Relate the interaction potential to the forces between molecules.
Watch different types of molecules form a solid, liquid, or gas. Add or remove heat and watch the phase change. Change the temperature or volume of a container and see a pressure-temperature diagram respond in real time. Relate the interaction potential to the forces between molecules.
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