ideal gases+ temp Flashcards
what are the assumptions of kinetic theory of gases
-the gas molecules have negligible volume compared to the volume of the gas as a whole
- the forces between gas molecules are negligible, except during collision
-collisions are perfectly elastic
-molecules are identical
- for an individual gas molecule, the time for a collision is negligible compared to the time between collisions
what is an ideal gas
a gas that obeys the gas law PV (proportional) T, where T is thermodynamic temperature
what are the mole equations
number of moles(n)= mass/ atomic mass
number of moles(n)= number of molecules(N)/
Avogrados constant
what is internal energy
the sum of a random distribution of kinetic and potential energies associated with the molecules of a system
why does an ideal gas only have kinetic energy for internal energy
There are no intermolecular forces so the molecules have no potential energy, hence why internal energy= kinetic energy
what is the zeroth law of thermodynamics
if two systems are in thermal equilibrium with a third system then they are also in equilibrium with each other
what is the first law of thermodynamics
U=q+w
what is thermal equilibrium
when there is no net heat transfer between two bodies
what is constant in a closed system
the total number of moles
total n before= total n after
what is specific heat capacity
the amount of heat required to change a unit mass of the body by 1 degree Celsius
what is a thermometric property
a physical quantity that varies with temperature
why would a thermocouple be used over a thermistor
-it can record rapidly changing temperatures (very responsive)
- it can measure localized temperature
why would a thermistor be used over a thermocouple
it has a lower least count of 0.1 ‘C, it is more sensitive than a thermocouple
what are the physical properties of a material that can be used to measure temperature
-density of a liquid
- volume of a gas at constant temperature
-resistance of a material
-emf of thermocouple
what improves the accuracy of measurement of temperature when using a thermometer
-using a smaller mass
- using a liquid with a lower SHC
