Heat And Temperatures Flashcards by Saadatu Tahir

The result of movement of tiny particles in solids liquids and gases is called

Heat energy

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Flow of heat is due to

Temperature difference between 2 objects

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The S.I unit for heat is

Joules

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Increase in K.E causes

Rise in temperature

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A body becomes cold when

It looses energy

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The degree of hotness or coldness of a body is called

Temperature

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A thermometer is used to measure

Temperature

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Two objects are in thermal contact when

Energy can be exchanged btw them

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When two objects in thermal contact cease to exchange energy by process of heat is called

Thermal equilibrium

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Triple point of water is at what temperature

273.16K or 0.01°C

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A scale of temperature should have

Thermometric property
To fixed points
A numerical scale

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Temperature where all thermometers show the same reading in called

Fixed point

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Ice point and triple point of water differ by

0.01K

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One Fahrenheit scale represents

100/180 or 5/9

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Temperature scale which is based on properties of local gases which only exist in theory is

Kelvin/absolute/thermodynamic temperature scale

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Temperature at which the pressure of an ideal gas becomes zero is

0K or absolute zero

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The combination of temperature and pressure at which at which liquid water, gaseous water and solid water coexist in equilibrium is called

Triple point of water
At 0.01°C and 4.58mmHg

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Conversion from °C to °F

Tf= ⁹/⁵ °C + 32

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Conversion from °F to °C

Tc = ⁵/⁹ + (°F - 32)

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Conversion from K to °F

Tf = ⁹/⁵ (K - 273.15) + 32

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Conversion from °F to K

Tk = 273.15 + ⁵/⁹ (°F - 32)

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Other temperature scales includes

Reaumer
Rankine

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A physical quantity which changes with change in temperature is known as

Thermometric property

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Change in volume with temperature is found in

Liquid-in-glass thermometer

Change in pressure of a fixed mass of gas at constant volume is found in

Constant volume gas thermometer

Change in electrical resistance with temperature is found in

Resistance thermometer

Change in pd across junctions at different temperatures is found in

Thermoelectric thermometer I.e thermocouple

Principle of operation in bimetallic thermometer is

The differential expansion of two metals of bimetallic strip

The temperature recorded by thermometer is _______ than the actual temperature

Less than Unless the body is constant temperature bath

Mercury is preferred to other liquids in liquid in glass thermometer due to

It's large expansion and uniformity

Mercury can measure range of temperature of

50°C to 350°C

The upper limit of Mercury thermometer can be raised to 550⁰C by

Filling with nitrogen in space of Mercury

Lower range of Mercury can be extended to 80⁰ by

Replacing Mercury with alcohol

Most sensitive thermometer is

Gas thermometer

Upper fixed point of gas thermometer can be extended to 1600⁰C by

Replacing hydrogen with nitrogen

What does replacing hydrogen with helium do to a gas thermometer

Extends its lower fixed point to -286⁰C

Normal range of gas thermometer is

-200⁰C to 500⁰C

In case of volume gas thermometer Tc and Tk are

Tc= (p-p⁰ / p¹⁰⁰ -p⁰) x 100 Tk= P/Ptr x 273.16

Resistance thermometers are also called

Resistance temperature detectors (RTD)

Resistance thermometers are represented by the equation

R = R⁰(1+@Tc) @ is temperature coefficient

Tc and Tk or resistance thermometers are represented by

Tc = (R-R⁰/R¹⁰⁰ -R⁰) x 100 Tk = R/Rtr x 273.16K

To measure low temperature ___________ resistance thermometer is used

Germanium, a semi conductor Used in range of 4K - 77K

A disadvantage of Mercury is

Low specific heat capacity

Thermoelectric thermometers are based on

See back effect

Emf produced in thermocouple is called

Thermo e.m.f

In thermocouple, when temp at 1 junction is 0⁰c

If one junction of a thermocouple is at 0⁰C, it varies with temperature as

♤= aTc + bT²c

Emf is measured by

Potentiometer

Thermocouple measure temperature in

In a linear path of emf vs temperature and as a normal range of -200⁰C - 1600⁰C

Which thermometer has lower thermal capacity and high thermal conductivity

Thermoelectric thermometer

A non conducting device which intercept and mearsure thermal radiation is

Pyrometer

The pyrometer measures temperature of

Hot object surface

Objects bright to the human eye are called

Incandescence

Pyrometers measure high temps such as furnace or glowing filament based on

Stefan law of thermal radiation represented by R = eA¤T⁴K ¤ is Stefan boltzmann constant

Temperature of the sun is measured by

Pyro-heliometer

Six's thermometer is popular among ______

Gardeners for use in green house

Vapour pressure thermometer is based on

The fact that svp Pressure of a liquid depends on temperature according to Log P = a+bTk+ c/Tk

Range for V P thermometer is 120K to 0.71K for different lliquid vapour

True

Curie law states that

Magnetic susceptibility of a paramagnetic salts varies inversely with its absolute temperature Tk @