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plumbing science Flashcards

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1
Q

what is latent heat?

A

Latent heat is energy absorbed or released during state change. The temperature remains constant.

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2
Q

what is sensible heat?

A

Sensible heat is energy that causes temperature change. No state change occurs. It is crucial in heating and cooling calculations.

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3
Q

How is materials measured?

A

Material measured in g/cm cubed, relative density 1000th of materials measured in kg/m cubed.

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4
Q

What is conducting?

A

conducting is when heat travels through a substance touching something.

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5
Q

What is convection?

A

Convected heat is when heat travels round a room. For example a radiator warms up the air around it, which then rises and circulates around the room

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6
Q

What is radiation?

A

Radiation heat is when you can feel heat come of it. For example the heat you feel of a fireplace is thermal radiation.

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7
Q

what is acceleration measured in?

A

meters per second squared m/s squared.

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8
Q

How is acceleration defined?

A

Distance travelled overtime that includes speeding up, slowing down and changing direction.

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9
Q

What is density measured in?

A

Kilograms per metre cubed. Kg/m cubed.

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10
Q

How is density defined?

A

Standard unit of material density, expressed directly in base SI units.

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10
Q

How is capacity measured?

A

Litre/L, a litre is a measurement of 1000 centimetres cubed.

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10
Q

how is area measured?

A

square meter, multiply length times width.

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11
Q

What is application in liquids?

A

Both latent heat and sensible heat are important.

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12
Q

what is volume measured in?

A

cubic metre/m cubed. Multiply length width and hight, 3-dimensional.

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12
Q

What is a ferrous metal?

A

A metal that contains iron as a primary element.

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12
Q

What is application in gasses?

A

Sensible heat is often more significant, consider the air conditioning systems.

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12
Q

what is mass measured in?

A

kilogram/kg

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12
Q

what is length measured in?

A

metre/m

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12
Q

what is pressure measured in?

A

1 bar is equal to 10m of water pressure.

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12
Q

What is a none ferrous metal?

A

Metals that do not contain iron.

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13
Q

what is ductility?

A

a material that has ability to stretch thin when tensile stress is applied.

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14
Q

what is hardness?

A

the resistance of a material.

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15
Q

what is LPG?

A

its a flammable gas that is heavier than most air.

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16
Q

what is a property of butane?

A

it has high calorific value and high temperature change.

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17
Q

what is a property of propane?

A

its boiling point is -45 degrees

18
Q

what is water at 100 degrees?

A

a gas

19
Q

what is water at 0 degrees?

A

a solid

20
Q

what is water at room temperature?

A

a liquid

21
Q

What is an alloy?

A

a mix of two or more metals.

22
Q

what is conduction?

A

when heat moves from one object to the other.

23
Q

what is the unit of power measured in?

A

The watt is the SI unit for power.

24
Q

what is the unit of heat measured in?

A

Joules

25
Q

what is the unit of energy measured in?

A

joules

26
Q

what is specific heat capacity?

A

amount of heat required to change a unit mass of that substance by one degree in temperature.

27
Q

what is it called when water is turned to steam?

A

evaporation

28
Q

what is it called when a solid is turned to water?

A

liquid

29
Q

what is it called when steam is turned back to water?

A

condensation

30
Q

what is it called when water turns to ice?

A

solidification

31
Q

what are 2 properties of a solid?

A

they have a fixed shape and they cannot be compressed.

32
Q

what are 2 properties of a gas?

A

particles can move freely in any direction and they can be compressed and squashed.

33
Q

what are 2 properties of a liquid?

A

liquids flow and take shape of a container and they cannot be squashed or compressed

34
Q

what is the flow rate?

A

the amount of fluid that flows in a given time

35
Q

what is pressure?

A

pressure is an expression of force exerted on a surface

36
Q

what is velocity?

A

the rate and direction of the change in the position or object.

37
Q

what does a roughness of a material surface mean?

A

rougher the pipe material the greater the resistance flow

38
Q

what will the difference in a pipe size define?

A

bigger the pipe the greater volume of gasses or liquids

39
Q

what will reductions in pipe size do?

A

a size reduction will reduce the pressure and the flow rate but increases the velocity.

40
Q

what is waters boiling point in kelvin?

A

373

41
Q

water at 0 degrees in kelvin is?

A

273

42
Q

what does painting central heating system do?

A

atmospheric corrosion

43
Q

what has a sinusoidal wave form?

A

AC electricity

44
Q

what would an anti-capillary groove in lead weathering stop?

A

water being drawn into building

45
Q

a change of state may occur when water is heated to?

A

1000C.

46
Q

which material is the best conductor of heat?

A

copper

47
Q

what will cause siphonage too occur?

A

suction at point c

48
Q

what will a decrease pipe size allow?

A

reduce flow

49
Q

what will a larger pipe allow?

A

water flows more slowly

50
Q

what does pipe diameter affect?

A

fluid velocity

51
Q

what do elbows restrict?

A

flow of water

52
Q

what does CWSC mean?

A

cold water storage cisterns

level 2 plumbing (1 decks)

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