Thermos Flashcards
What is a Primary Quantity?
A basic SI unit
Name 4 SI units and their symbol
Mass, kg, m
Displacement, m, L
Time, s, t
Temperature, K, T
What’s a Derived quantity?
A combination of Derived quantities
Name 4 derived quantities, symbols and units
Area, A, m^2
Volume, V, m^3
Velocity, v, m/s
Acceleration, a, m/s^2
What is an Intensive property?
Properties independently of mass of substance (eg pressure and temp)
What is an Extensive property?
Dependent on the mass of substance in question (eg volume and energy)
What is a specific property?
Extensive properties expressed per unit pass (eg per kg)
Name 3 specific properties, their symbol and units
Specific heat energy transfer, q, J/kg
Specific work energy transfer, w, J/kg
Specific volume, v, m^3/kg
Explain thermal expansion
Heating causes atoms in the material to vibrate more, thus taking up more space, and the material expands.
3 types of thermal expansion?
Linear
Superficial
Volumetric
What’s is the change in size of an object dependent on?
Material
Temperature change is exposed to
Original size
What is the coefficient of linear expansion?
Alpha. Length a material will expand when it’s raised by one degree. Units /C or /K
What’s the coefficient of superficial expansion?
Beta. Amount the area of the material increases when raised by one degree. Beta = 2 alpha.
What’s the coefficient of Volumetric expansion?
Gamma. Amount the volume of material increases by when it’s raised by one degree. Gamma = 3alpha
What is energy?
The ability to do work (Joules)
What is Specific heat capacity?
Amount of heat energy needed to raise the temp of 1kg of material by 1 Celcius/Kelvin
