Plumbing Science Flashcards
What four different groups can metal be divided into
Alloy
Pure
Ferrous
Non-ferrous
What two types of plastic are there
Thermoplastic
Thermo-setting plastics
What different type of liquid do you come across in plumbing
Water
Refrigerant
Anti-freeze/glycol mixes
Fuel oils
Lubricant/greases
What is toughness
The amount of energy a material can absorb without breaking or fracturing
What is strength
The measure of how Material withstand heavy loads without breaking
What is shear strength
The maximum force a material can withstand when being ripped
What is elasticity
The length that a material can be stretched and return to it’s original length when released
What is the si unit for temperature
Kelvin
What three different ways can you transfer heat
Conduction
Convention
Radiation
What a three states of matter
Solid
Liquid
Gas
What is the si unit for mass
Kilograms
What is compressive strength
The maximum force a material can withstand when being crushed
What is hardness
The resistance of material to being cut , deformed or bent
What is torsion strength
The maximum force a material can withstand when being twisted
What is heat and electrical conductivity
The measure of how well a material conducts heat and electricity
What is heaviness
The denseness of a material. A dense material will be heavy in relation to its size
What is the purpose of insulation in a hot water cylinder?
To prevent heat loss and save energy
How is soldering able to run a pipe
Capillary action
What type of water corrodes pipe work
Soft water
Which type of water is difficult to lather
Hard water
Limescale deposits form by which type of water?
Temporary hard water
What percentage does water expand by when it’s frozen?
10%
What temperature is water’s maximum density?
4 degrees Celsius
What is velocity
The rate and direction of the change in the position of an object
What is acceleration
Acceleration is defined as the rate at which an object changes its velocity
What is flow rate
The amount of fluid that flows in a given time
What is force
A force is a push or pull upon an object that causes a change in the motion of that object
What is force due to gravity
The force of gravity is the force exerted by the gravitational field of a massive object on anybody within vicinity of it’s surface
What is pressure
Pressure is an expression of force exerted on a surface per unit area
What is atmospheric pressure
An atmosphere (atm) is a unit of pressure based on the average
atmospheric pressure at sea level. The actual atmospheric pressure
depends on many conditions, e.g. altitude and temperature.
What is polypropylene used for
Push-fit waste and overflow pipe
Cold water storage cistern
What is polybutylene used for
Push fit hot and cold water installation
Central heating installation
How do you measure volume
Length x width x height
What is the thermal conductivity of silver
406.0
What is thermal conductivity of copper
397.0
What is thermal conductivity of gold
317.0
What is thermal conductivity of brass
109.0
What is the thermal conductivity of steel
50.2
What is the thermal conductivity of lead
34.7
What type of simple machine are there
Levers
Pulley
Archimedean screws
What is siphonage
the loss of water seal from fixture traps resulting from partial vacuum in the drainage system
