2 Flashcards
(23 cards)
What is thermal expansion?
The expansion of a substance on heating
What happens to most substances when heated?
They expand on heating and contract on cooling
What is the linear expansion?
The increase in length of a solid when heated
What is superficial expansion?
The increase in area of a solid when heated
What is cubical expansion?
The increase in volume of a solid, liquid, or gas when heated
Which substance is known to contract when heated below a certain temperature?
Silica below 80°C
What is the S.I. unit of heat?
Joule (J)
What is the S.I. unit of temperature?
Kelvin (K)
How is temperature measured?
By a thermometer
What is the relationship between Celsius and Kelvin?
TK = 273 + °C
True or False: Heat and temperature are the same.
False
What determines the direction of heat flow?
The temperature difference between two bodies
What happens when two bodies at different temperatures are placed in contact?
The resultant temperature is a temperature in between the two temperatures
What is the effect of heating on the diameter of a metal ball?
The diameter of the ball increases on heating
Fill in the blank: The amount of heat contained in a body depends on its _______.
[mass, temperature, and material of the body]
What occurs to a wire when it is heated?
Its length increases (it expands)
What is the outcome of cooling a solid?
It contracts
In thermal expansion, which state of matter expands the most?
Gases
What is the principle of calorimetry?
It measures the quantities of heat contained in bodies
What does thermal state indicate?
The degree of thermal energy in a body
What happens to the kinetic energy of molecules when a body receives heat energy?
The kinetic energy increases due to random motion
What is an example of a demonstration of cubical expansion in liquids?
Filling a bottle with water and adding drops of ink to observe expansion
What is the effect of temperature on the vibration of particles in a body?
The particles start vibrating more vigorously as temperature rises
