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Questions and Answers
What is the absolute zero temperature in Celsius?
What is the absolute zero temperature in Celsius?
- -100
- 0
- -32
- -273.15 (correct)
Which thermometric property changes with temperature?
Which thermometric property changes with temperature?
- 0.5
- 1000
- 76 (correct)
- 2
At what temperature does the triple point of water occur on the Kelvin scale?
At what temperature does the triple point of water occur on the Kelvin scale?
- 373.15
- 273.15
- 273.16 (correct)
- 0
What is the pressure at the ice point temperature?
What is the pressure at the ice point temperature?
How much is the temperature in Celsius when it is 212°F?
How much is the temperature in Celsius when it is 212°F?
What is the fundamental interval on the Kelvin scale?
What is the fundamental interval on the Kelvin scale?
What does the equation $T_K = T_C + 273.15$ represent?
What does the equation $T_K = T_C + 273.15$ represent?
What temperature corresponds to 100°C in Kelvin?
What temperature corresponds to 100°C in Kelvin?
What does heat transfer require between two objects?
What does heat transfer require between two objects?
According to the Zeroth Law of thermodynamics, what conclusion can be drawn if objects A and C are in thermal equilibrium and objects B and C are also in thermal equilibrium?
According to the Zeroth Law of thermodynamics, what conclusion can be drawn if objects A and C are in thermal equilibrium and objects B and C are also in thermal equilibrium?
What is thermal equilibrium?
What is thermal equilibrium?
What common misunderstanding about temperature can arise from touching objects of different thermal conductivities?
What common misunderstanding about temperature can arise from touching objects of different thermal conductivities?
Which of the following statements is NOT true regarding thermometers?
Which of the following statements is NOT true regarding thermometers?
Which temperature scale is considered a thermodynamic scale?
Which temperature scale is considered a thermodynamic scale?
What is the primary factor that thermometers rely on for measuring temperature?
What is the primary factor that thermometers rely on for measuring temperature?
Which of the following is a reason why our senses may provide a misleading indication of temperature?
Which of the following is a reason why our senses may provide a misleading indication of temperature?
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Study Notes
Heat
- Heat is the transfer of energy between objects due to a temperature difference.
- Thermal contact is required for heat transfer.
- Heat always flows from a warmer object to a colder object.
Zeroth Law of Thermodynamics
- Two objects in thermal equilibrium with a third object are also in thermal equilibrium with each other.
- This law allows for the development of thermometers.
- Provides a basis for comparing temperatures.
Thermal Equilibrium
- Objects in thermal equilibrium do not exchange energy through heat or electromagnetic radiation.
- This occurs when objects in thermal contact cease to exchange energy.
Thermal Conductivity
- The rate at which heat flows through a material.
- Higher conductivity materials, such as metal, transfer heat more readily than lower conductivity materials, like plastic.
- Can create misleading perceptions about the true temperature of an object.
Thermometers
- Devices used to measure the temperature of a system.
- Temperature measurements depend on the measuring device and the temperature scale used.
Thermodynamic (Kelvin) Scale
- Ice point (273.15 K): The temperature at which water freezes.
- Triple point of water (273.16 K): Temperature at which water exists as solid, liquid, and gas in equilibrium.
- Steam point (373.15 K): The temperature at which water boils.
- Absolute zero (0 K): The theoretical temperature at which all molecular motion ceases.
Celsius Scale
- Ice point (0 °C): The temperature at which water freezes.
- Steam point (100 °C): The temperature at which water boils.
- Relationship to Kelvin: TK = TC + 273.15 or TC = TK - 273.15
Fahrenheit Scale
- Ice point (32 °F): The temperature at which water freezes.
- Steam point (212 °F): The temperature at which water boils.
- Relationship to Celsius: TF = 9/5 TC + 32 or TC = 5/9 (TF - 32).
Thermometric Properties
- Physical properties that change with temperature.
- Used in thermometers to measure temperature.
- Examples include:
- Volume/length of a liquid
- Length of a solid
- Pressure of a gas at constant volume
- Volume of a gas at constant pressure
- Electric resistance of a conductor
- The colour of an object
- The emf of a thermocouple
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