Thermodynamics of Water Phases

The video tutorial explains how to determine the phase of a substance, such as H2O, at a given temperature or pressure using the vapor pressure curve. It covers the concepts of saturated, compressed liquid, and superheated vapor phases. The tutorial also discusses the use of tables A4, A5, and A6 for determining specific properties based on phase and provides examples to illustrate the process. The video concludes with practice problems to reinforce learning.

What is the primary tool used in thermodynamics to determine the phase of a substance?

• Molecular weight

• Vapor pressure curve

• Heat capacity

• Thermal expansion

In a vapor pressure curve, what does a point above the curve indicate?

• Saturated vapor

• Compressed liquid

• Superheated vapor

• Solid phase

What assumption is made for liquids when they are above the vapor pressure curve?

• Incompressible assumption

• Variable density assumption

• Compressible assumption

• Ideal gas assumption

Which table should be used for properties of a liquid under the incompressible assumption?

• Table A4

• Table A7

• Table A6

• Table A5

When can the ideal gas law be applied to a gas phase?

• When pressure is in kPa and temperature is below 500 degrees C

• When temperature is above 500 degrees C

• When pressure is in megapascals

• When the substance is a liquid

In the example with H2O at 80 degrees C and 40 kPa, what phase is the substance in?

• Plasma phase

• Gas phase

• Solid phase

• Liquid phase

For H2O at 10 MPa and 100 degrees C, which phase is it in?

• Plasma phase

• Solid phase

• Gas phase

• Liquid phase

What is the specific volume of H2O in liquid phase at 100 degrees C according to Table A4?

• 0.01043 m³/kg

• 0.001043 m³/g

• 0.01043 m³/g

• 0.001043 m³/kg

For H2O at 4.5 MPa and 275 degrees C, which table should be used to find the specific volume?

• Table A5

• Table A4

• Table A6

• Table A7

What is the phase of H2O at 225 kPa and 147 degrees C?

• Liquid phase

• Solid phase

• Plasma phase

• Gas phase