Plumbing science Flashcards
What is latent heat?
energy absorbed or released by a substance during a change in its physical state (phase) that occurs without changing its temperature.
What is sensible heat?
that can be felt or measured, and is the energy that causes a change in the temperature of an object without changing its phase.
What is the SI unit of mass?
KG
What unit is used for area
Meter squared
What is convection
motion in a gas or liquid in which the warmer portions rise and the colder portions sink.
What is radiation
energy that moves from one place to another in a form that can be described as waves or particles.
What is conduction
the transfer of heat through matter (i.e., solids, liquids, or gases) without bulk motion of the matter.
What is density measured in?
Kilograms per metre cubed Kg/m3
What do you do as a safety precaution before soldering?
Make sure there’s a form of ventilation such as windows open or flue vents or extractor fan
What unit would you use for time
S
What is the SI unit for electrical current
A (Amperes)
What unit is used for time
S (seconds )
What is a Non ferrous metal
Tin
What is steel made up of
A Mixture of iron and carbon
What is bronze made of
A mixture of copper and tin
What is a type of plastic
Thermoplastics
What is gun metal
A mixture of copper , tin and zinc
What is mdpe
Medium density polyethylene
What is hdpe
High density polyethylene
Tensile strength
how well a material reacts to being pulled + stretched
Compressive strength
the maximum stress a material can sustain whilst being crushed.
Shear Strength
the ability to withstand stress caused by a pair of opposing forces acting along a parallel line through a material
Capillary attraction
the process where any fluid can be drawn upwards through small gaps against the action of gravity.
Boyle Law
If the pressure is doubled the volume of gas is halved
The Bernoulli effect
If a pipe is reduced in size then an increase in the speed of the fluid occurs simultaneously with a decrease in the pressure or a decrease in the fluids potential energy
Current
is the rate of flow of charge around a circuit (current will flow through a component if there is a voltage across a component, ampere)
voltage
(potential difference) is the driving force that pushes current around, volts, v
Resistance
Anything in the circuit which slows the flow down, Ohms
Force (resultant force), mass , acceleration
Force = Newtons
Mass= Kg
Acceleration= m/s2
Force, pressure and area
Pressure = Force( divide ) Area
Pressure = N/M2 or Pascal (Pa)
Force= Newtons
Area= M2
What basic laws of nature does plumbing follow?
gravity, pressure and water seeking its own level.
Can there be overlapping of the two subsystems?
Because of pollution issues, there must be a separation.
kPa
kilopascal
specific heat capacity
the energy required to raise the temperature of one gram of a substance by one degree Celsius
Plasticity
The exact opposite of elasticity - a material which does not return to its original shape when deformed.
Water regulations 1999 is to prevent
contamination of a water supply
- waste of water (leaking fitting/dripping tap)
- misuse of a water supply (use for any other purpose than what its for)
- undue consumption of water (fittings and appliances that use more water for the purpose they were designed)
- erroneous measurement (by passing of a water meter - fiddling with the meter)
what is the pH value of water
7pH
where in the UK is hard water found , and how is hardness in water measured
Iron or copper pipes, it can be measured by looking at the pressure of the water.
Above what temperature do calcium carbonates start to leave hard water
above 75 degrees Celsius
What is a drawback of soft water?
pipe corrosion, environment impact, health risks
what is everything on earth made up of
atoms
what is direct current made up of
Direct Current is generated by a number of sources. It can be
generated by photo-voltaic (PV) panels or as a result of an
electrochemical reaction. DC current can be stored in cells
and batteries.
how does alternating current work
Alternating Current does not travel in one direction. It reverses its
direction of travel from positive to negative and from negative to
positive, constantly. In other words, it alternates.
