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Phys 131 > Heat And Temperatures > Flashcards

Heat And Temperatures Flashcards

1
Q

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

A

Heat energy

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2
Q

Flow of heat is due to

A

Temperature difference between 2 objects

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3
Q

The S.I unit for heat is

A

Joules

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4
Q

Increase in K.E causes

A

Rise in temperature

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5
Q

A body becomes cold when

A

It looses energy

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6
Q

The degree of hotness or coldness of a body is called

A

Temperature

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7
Q

A thermometer is used to measure

A

Temperature

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8
Q

Two objects are in thermal contact when

A

Energy can be exchanged btw them

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9
Q

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

A

Thermal equilibrium

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10
Q

Triple point of water is at what temperature

A

273.16K or 0.01°C

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11
Q

A scale of temperature should have

A

Thermometric property
To fixed points
A numerical scale

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12
Q

Temperature where all thermometers show the same reading in called

A

Fixed point

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13
Q

Ice point and triple point of water differ by

A

0.01K

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14
Q

One Fahrenheit scale represents

A

100/180 or 5/9

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15
Q

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

A

Kelvin/absolute/thermodynamic temperature scale

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16
Q

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

A

0K or absolute zero

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17
Q

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

A

Triple point of water
At 0.01°C and 4.58mmHg

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18
Q

Conversion from °C to °F

A

Tf= ⁹/⁵ °C + 32

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19
Q

Conversion from °F to °C

A

Tc = ⁵/⁹ + (°F - 32)

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20
Q

Conversion from K to °F

A

Tf = ⁹/⁵ (K - 273.15) + 32

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21
Q

Conversion from °F to K

A

Tk = 273.15 + ⁵/⁹ (°F - 32)

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22
Q

Other temperature scales includes

A

Reaumer
Rankine

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23
Q

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

A

Thermometric property

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24
Q

Change in volume with temperature is found in

A

Liquid-in-glass thermometer

25
Q

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

A

Constant volume gas thermometer

26
Q

Change in electrical resistance with temperature is found in

A

Resistance thermometer

27
Q

Change in pd across junctions at different temperatures is found in

A

Thermoelectric thermometer
I.e thermocouple

28
Q

Principle of operation in bimetallic thermometer is

A

The differential expansion of two metals of bimetallic strip

29
Q

The temperature recorded by thermometer is _______ than the actual temperature

A

Less than
Unless the body is constant temperature bath

30
Q

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

A

It’s large expansion and uniformity

31
Q

Mercury can measure range of temperature of

A

50°C to 350°C

32
Q

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

A

Filling with nitrogen in space of Mercury

33
Q

Lower range of Mercury can be extended to 80⁰ by

A

Replacing Mercury with alcohol

34
Q

Most sensitive thermometer is

A

Gas thermometer

35
Q

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

A

Replacing hydrogen with nitrogen

36
Q

What does replacing hydrogen with helium do to a gas thermometer

A

Extends its lower fixed point to -286⁰C

37
Q

Normal range of gas thermometer is

A

-200⁰C to 500⁰C

38
Q

In case of volume gas thermometer Tc and Tk are

A

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

39
Q

Resistance thermometers are also called

A

Resistance temperature detectors (RTD)

40
Q

Resistance thermometers are represented by the equation

A

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

41
Q

Tc and Tk or resistance thermometers are represented by

A

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

42
Q

To measure low temperature ___________ resistance thermometer is used

A

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

43
Q

A disadvantage of Mercury is

A

Low specific heat capacity

44
Q

Thermoelectric thermometers are based on

A

See back effect

45
Q

Emf produced in thermocouple is called

A

Thermo e.m.f

46
Q

In thermocouple, when temp at 1 junction is 0⁰c

A
47
Q

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

A

♤= aTc + bT²c

48
Q

Emf is measured by

A

Potentiometer

49
Q

Thermocouple measure temperature in

A

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

50
Q

Which thermometer has lower thermal capacity and high thermal conductivity

A

Thermoelectric thermometer

51
Q

A non conducting device which intercept and mearsure thermal radiation is

A

Pyrometer

52
Q

The pyrometer measures temperature of

A

Hot object surface

53
Q

Objects bright to the human eye are called

A

Incandescence

54
Q

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

A

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

55
Q

Temperature of the sun is measured by

A

Pyro-heliometer

56
Q

Six’s thermometer is popular among ______

A

Gardeners for use in green house

57
Q

Vapour pressure thermometer is based on

A

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

58
Q

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

A

True

59
Q

Curie law states that

A

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

Phys 131 (1 decks)

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