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Physics > Thermodynamics > Flashcards

Thermodynamics Flashcards

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1
Q

What is heat?

A

Energy in transit due to temperature differences

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2
Q

How do you calculate Celsius to Fahrenheit?

A

9/5 celsius + 32

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3
Q

How do you calculate Celsius from Fahrenheit?

A

5/9 Fahrenheit -32

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4
Q

What does Fahrenheit divide the spread between freezing and boiling points?

A

180 degrees

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5
Q

What is absolute temperature measured in?

A

Kelvin and rankines

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6
Q

What is total temp the sum of?

A

Static temperature and temperature rise caused by ram effect.

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7
Q

What is the SI unit of heat energy?

A

Joule

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8
Q

What is calorie?

A

Heat required to raise the temperature of one gramme of water by one Celsius degree.

1 cal = 4.1868 joules

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9
Q

What is British thermal unit?

A

Energy required to raise the temperature of 1lb of water by 1 Fahrenheit degree.

1 BTU = 1055.06 joules

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10
Q

How many BTU is one therm?

A

100,000 BTU

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11
Q

What has the highest specific heat of any substance?

A

Water (except for hydrogen)

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12
Q

What’s the formula for changing a solid to a liquid with finding the thermal energy?

A

Thermal energy = latent heat x mass

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13
Q

What heat changes a solid to a liquid?

A

Latent heat

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14
Q

What is boyle’s law?

A

Relationship between pressure and volume of a gas.

Pressure exerted by a gas held at constant temp varies inversely with volume.

V1/V2 = P2/P1

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15
Q

What is Charles law?

A

Direct relationship between temperature and volume of gas.

Assuming no change in pressure, doubling of absolute temperature would double the volume of that gas.

V1/V2 = P1/P2

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16
Q

What is absolute humidity?

A

Actual water content of the air.

Mass/volume

17
Q

What is relative humidity?

A

The amount of water in relation to how much water could be held.

Dew point. (Actual vapour/ possible vapour)

18
Q

What is specific humidity?

A

Mass of water vapour in a unit of dry air.

Mass of water vapour/ mass of dry air + mass of water vapour.

19
Q

What does a hygrometer measure?

A

Humidity.

One dry bulb and one moist bulb.

20
Q

How can you work out work done?

A

Pressure x change in volume

21
Q

What are the 3 ways of heat transmission ?

A

Conduction, convection and radiation

22
Q

How does conduction heating work?

A

Heat transferred from one particle to another.

23
Q

What is convection heating?

A

Liquids and gases.

Fluids flow from one place to another because of density difference causing unequal temps.

24
Q

How does radiation occur?

A

Through electro magnetic waves

25
Q

What surfaces are the best emitters of radiation?

A

Rough unpolished surfaces

26
Q

What is the expansion of liquids to solids?

A

10 times that of solids.

27
Q

What is increasing entropy?

A

Energy being lost which cannot be used.

Physics (6 decks)

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