Expansion And Conduction Flashcards
What is the definition of thermal expansion?
Thermal expansion is the increase in size of a substance as its temperature increases.
True or False: All materials expand when heated.
False
Fill in the blank: The phenomenon where materials contract when cooled is called __________.
thermal contraction
What is the main cause of thermal expansion?
The main cause of thermal expansion is the increased kinetic energy of particles as temperature rises.
Multiple choice: Which of the following materials generally has the highest coefficient of thermal expansion? A) Metals B) Liquids C) Gases D) Solids
C) Gases
What is the formula for linear expansion?
ΔL = αL₀ΔT
Define the term ‘coefficient of linear expansion’.
The coefficient of linear expansion is a constant that quantifies the change in length per degree change in temperature.
True or False: The coefficient of thermal expansion is the same for all materials.
False
What happens to the volume of a gas when it is heated at constant pressure?
The volume of the gas increases.
Fill in the blank: The change in volume due to temperature change can be calculated using the formula __________.
ΔV = βV₀ΔT
What is ‘thermal stress’?
Thermal stress is the stress induced in a material due to changes in temperature causing expansion or contraction.
Multiple choice: Which of the following is NOT a type of thermal expansion? A) Linear B) Area C) Volume D) Magnetic
D) Magnetic
What is the relationship between temperature and the kinetic energy of particles?
As temperature increases, the kinetic energy of particles also increases.
True or False: Expansion joints are used in construction to allow for thermal expansion.
True
What is the effect of thermal contraction on metals upon cooling?
Metals shrink in size and may fit more tightly together.
Fill in the blank: The coefficient of volume expansion is represented by the symbol __________.
β
Multiple choice: Which of the following materials expands the least upon heating? A) Wood B) Glass C) Steel D) Rubber
C) Steel
What is a practical application of thermal expansion in everyday life?
Thermal expansion is used in thermostats to control heating systems.
True or False: Liquids expand more than solids when heated.
True
What happens to the density of a substance as it expands?
The density of a substance decreases as it expands.
Fill in the blank: The principle of __________ states that materials will expand or contract uniformly when subjected to temperature changes.
uniform expansion
What is the significance of understanding thermal expansion in engineering?
Understanding thermal expansion is crucial for designing structures that can withstand temperature changes.
Multiple choice: Which of the following is a common effect of thermal expansion in bridges? A) Cracking B) Buckling C) Both A and B D) None of the above
C) Both A and B
True or False: All liquids expand equally when heated.
False
