Understand Properties Of Materials

Question 1

What is water, copper and brass’ relative densities

Answer 1

Water RD = 1 = 1000 mass/m3
Copper= 9= 9000 mass/m3
Brass= 8.4= 8400 mass/m3

Question 2

Relative density or specific gravity of gases

Answer 2

Air = 1
Natural gas = 0.7 lighter than air
Propane = 1.5 heavier than air
Butane= 2.0

Question 3

What are alloys

Answer 3

A mixture of two or more metals
Brass( copper and zinc)
Bronze ( copper/ tin)
Gunmetal ( copper/tin/zinc)
Steel ( iron/carbon)

Question 4

Ferrous materials

Answer 4

Contain iron
Steel and cast iron
Corrode easily

Question 5

Polyethylene, polypropylene, polybutylene and ABS do what?

Answer 5

Polyethylene (MDPE cold mains and gas)
Polypropylene ( pushfit waste and overflow spray with lubricant)
Polybutylene ( pushfit hot,cold and central heating)
ABS (solvent welded waste pipes GLUE

Question 6

Copper pipe imperial measures

Answer 6

1\2” is 15 mm
3/4” is 22 mm
1” is 28mm
1 1/4 is 35mm
1 1/2 is 42 mm
2” is 54mm