Thermodynamics Flashcards
7 cards from real Ramsay Test practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Thermodynamics flashcards as text
What happens to most substances when they are heated?
Answer: They expand
Most materials expand as heating increases molecular motion and spacing.
In which direction does heat naturally flow between two objects in contact?
Answer: From hot to cold
Heat spontaneously flows from a higher temperature to a lower temperature.
What is the energy associated with the total molecular motion of a substance called?
Answer: Internal energy
Internal energy is the sum of the kinetic and potential energy of the molecules.
A surface that is a good emitter of radiant heat is typically what color?
Answer: Dull black
Dull black surfaces are the best emitters and absorbers of thermal radiation.
What is enthalpy a measure of in a thermodynamic system?
Answer: Total heat content at constant pressure
Enthalpy represents the total heat content of a system at constant pressure.
When water vapor in air turns to liquid on a cold surface, the process is called what?
Answer: Condensation
Condensation is the phase change from gas to liquid, releasing latent heat.
Why do two metals in a bimetallic strip bend when heated?
Answer: They expand at different rates
Different thermal expansion coefficients cause the strip to curve when heated.