Notesale: Turn your study into money

Document Preview

Extracts from the notes are below, to see the PDF you'll receive please use the links above

---

Page | 1

Temperature
Temperature
Two objects of different masses made of the same material at the same temperature would
have different amounts of heat
...
Temperature does not measure the amount of thermal energy in a body
...
Thermal equilibrium is a condition when two or more objects are in contact and
have the same temperature so that there is no net flow of energy between them
...
Zeroth law of thermodynamics states that if
object A is in thermal equilibrium with object B and B is in thermal equilibrium with object C
then object A and object C must be in thermal equilibrium
...

Physical properties should have the following qualities—
1) Change in property with temperature should be large enough to be measured accurately,
2) Value of temperature recorded should be reproducible (mass and density should be the
same when measured second time),
3) Property being used must be suitable over temperature range measured,
4) Should be able to calibrate easily and property should change uniformly with temperature
...
Temperature has two fixed points- the melting point of pure ice and the boiling point of
pure water divides the range between thermistor 100 equal intervals when pressure changes
...
Based on the idea that average kinetic energy of particle of a substance
increases with temperature and the average kinetic energy are same for all substance at a
particular temperature

...
Triple point of pure water is the temperature at which water exists as vapor, liquid and
solid at 273
...
The thermometric property is ice and steam points and the property has
the value at an unknown temperature
...
If there is a
temperature difference between the junctions an emf is formed which is measured by the
voltmeter
...
Both thermocouple and thermistor can calculate the temperature by using a
calibration curve
...
For modern thermo-couple this is
not true
Non- linear so requires calibration
Fairly linear over a narrow range
Can be very wide
Narrow range
Long conducting wires allow the operator to
Long conducting wires allow the operator to
be at a distance from the thermometer
be at a distance from the thermometer
Junctions are small so have a small thermal
Are very stable and mostly unaffected by
capacity so response time is small
aging
Robust
Very robust
Sensitivity is dependent on the choice of
Very sensitive but only over a narrow range of
metals that are made up of the two types of
temperature
wires
...

Thermal equilibrium- a condition when two or more objects in contact have the same
temperature so there is no net flow of energy between them
...
16 kelvin (0

---