Heat And Temperature Flashcards
Zeroth law of thermodynamics
If bodies A and B are in thermal equilibrium with a third body (thermometer) then A and B are in thermal equilibrium with each other
Is system for temperature
Kelvin
Average temperature on Earth
288 degree Kelvins
With temperature increase, what happens to a liquids volume? Or metals volume?
It increases except for water (weird temperature changes)
Converting Celsius into Kelvins
Celsius = T - 273.15
Thermal expansion formula for length
🔺L=La🔺T
Change in length = original length * coefficient for expansion *change in temperature
Thermal expansion formula for Area of 2D
Change of Volume formula
B is volume coefficient
What is Q in relation to temperature?
It is Heat usually in the SI unit of joules (J)
Changing physical state formula
L here is the heat of transformation. For example Lv is the energy needed to vaporise a liquid into vapour
Importance of Q being negative or positive
If Q is positive = environments temperature onto a system
If Q is negative = Systems energy to the environment
What is C in relation to temperature
C is Heat capacity of an object
What formula is used for heat capacity?
Work done by gas formula
W = work
P = pressure
Explain this formula and what it does
This is the conduction formula
Q = Heat
t = Time
K = Thermal conductivity
A = Area
Th = hotter temperature
Tc = Colder temperature
L = length of slab
