Types of Thermodynamic Systems

Questions and Answers

Only energy can cross the boundary

Mass and energy can cross the boundary

Mass cannot cross the boundary, but energy can (correct)

No interaction with the surrounding

32°F for freezing point and 212°F for boiling point of water

-273°C for absolute zero

0°C for boiling point and 100°C for freezing point of water

0°C for freezing point and 100°C for boiling point of water (correct)

A real gas with complex molecular interactions

A gas that only interacts with its container

A gas that takes up no volume

A hypothetical gas with simplified molecular interactions (correct)

It has no volume Signup and view all the answers

To measure temperature in thermodynamic calculations Signup and view all the answers

Mass can cross the boundary in an open system Signup and view all the answers

32°F Signup and view all the answers

Elastic collisions only Signup and view all the answers

Study Notes

A closed system has a fixed amount of mass, and no mass can cross its boundary, but energy can enter or leave in the form of heat or work.
An open system allows both mass and energy to cross its boundary, which is called a control surface.
An isolated system does not interact with its surroundings, meaning there is no heat transfer across the system boundary.

The Celsius temperature scale is based on 0°C for the freezing point of water and 100°C for the boiling point of water.
The Fahrenheit temperature scale is based on 32°F for the freezing point of water and 212°F for the boiling point of water.
The absolute temperature scale is based on the temperature at which the amount of energy stored inside a body completely vanishes, and is used in thermodynamic calculations.

An ideal gas is a hypothetical gas composed of molecules that follow certain rules, used to model and predict the behavior of real gases.
Ideal gas molecules do not attract or repel each other, and only interact through elastic collisions with each other or the container walls.
Ideal gas molecules are approximated as point particles that take up no volume, with the gas taking up volume due to the expansion of the molecules.
The equation of state of an ideal gas is PV = nRT, where n is the number of moles of the gas, R is the gas constant, and P, V, and T are the pressure, volume, and temperature of the gas, respectively.