Plumbing 🔬 Flashcards
What are the 4 different groups of metals?
1.Pure metals
2.Alloys
3.Ferrous metals
4.non-ferrous metals
What is a ferrous metal?
Ferrous metals refer to any metal that contains iron, that means they don’t rust.
What are the two types of plastic?
Thermoplastics and thermo-setting plastic
What is the definition of hardness in plumbing science?
The resistance of material to being cut, deformed or bent.
What is compressive strength?
The maximum force a material can withstand when being crushed?
What is ductility?
The amount that a material can be pulled
What is the ph number for pure water?
7
What is the freezing point of water at sea level in degrees C
0
What are the 3 elements of the fire triangle?
Heat fuel and oxygen
What would decreasing the pipe size do to the flow rate and the velocity?
It would reduce the flow rate and increase the velocity
How is hard water formed?
Hard water is formed when water percolates through deposits of limestone
What do the letters DZ stand for on brass fittings?
De-zinced
What is density equal too?
It’s total mass divided by it’s total volume
What is an alloy?
Two metals that are mixed together
What is meant by the term calorific value?
The energy contained in a fuel or food
What is another way of measuring temperature?
Kelvin
What is bar used for?
It is the unit that we measure water pressure with
Is copper ferrous or non ferrous?
Non-ferrous
Is lead ferrous or non ferrous?
Non ferrous
What is torsion strength?
The maximum force a material can withstand when being twisted
What are the two types of plastic used in domestic plumbing
Thermo and thermo-setting plastics
What is galvanic corrosion
Galvanic corrosion occurs when two dissimilar metals are in contact with each other through the presence of an electrolyte
What is the formula for pressure
Force divided by area
What is the si unit for length
M
What is the unit of power
The watt is the si unit for power
The unit of heat is
Joules
What is the freezing point of water in kelvin
273k
What is the boiling point of water in kelvin
373k
How much percent dose water expand by
10%
What is conduction
Conduction occurs when when heat travels through a substance
what dose soft water contain?
carbon dioxide
how dose water become temporarily hard water
by passing through calcium carbonate
is lpg heavier than air
yes
what is SHC?
is the amount of heat required to change a unit mass of that substance by one degree in temp
what is everything on earth made up of?
atoms
