International System of Units Flashcards
What does SI Unit stand for?
International System of Units
Which system is the only system of measurement with an official status in nearly every country in the world?
SI Unit
What is the unit name for time?
second
What is the unit symbol for time?
s
What is the dimension symbol for time?
T
What is the unit name and symbol for length?
Metre and m
What is the dimension symbol for length?
L
What type of value is the Metre?
metric
Aviation uses which type measurement of distance for navigation?
nautical mile (nm)
Why does aviation use the nautical mile for a measurement of distance for navigation.
Because of its correlation to the surface of the earth.
1 Metre is how many feet?
3.28 feet
What are common types of imperial measurements?
inches, feet and miles
What are two places that predominantly use imperial measurements?
USA and UK
Side note: Aircraft built in countries where imperial measurement is predominant may still use the imperial measurements.
What are the SI Unit’s?
Time, Length, Mass, Temperature, Force and Pressure.
What is the unit name for Mass?
kilogram
What is the unit symbol for mass?
kg
What is the dimension symbol for Mass?
M
What type of value is kilogram?
metric
1 kilogram = how many pounds?
2.2
What is the unit name for temperature?
Kelvin
What is the unit symbol for temperature?
K
The Kelvin scale is what kind of scale?
an absolute scale
What point does the absolute scale use as it null point?
absolute zero
What are two other types of of temperature measurements?
Celsius (metric) and Fahrenheit (Imperial)
What Celsius temperature is Kelvin null point equivalent to?
-273°C
What Fahrenheit temperature is Kelvin null point equivalent to?
-459.67°F
What K temperature does water boil?
373K
What K temperature does water freeze?
273K
True or false do K and °C have the same magnitude?
True
In physics a force is?
is any interaction that, when unopposed, will change the motion of an object.
How is a force a vector quantity?
By have both a magnitude and direction.
How is force measured in the SI unit?
Newtons
What symbol is force represented by?
F
What is pressure?
the force applied perpendicular to the surface of an object per unit area over which that force is distributed.
What is the SI Unit for pressure?
Pascal
What is the symbol used for pressure?
P
What is a Pascal in the metric system?
A Pascal can be defined as one newton per square metre in the metric system.
What is the imperial system for measuring pressure?
Pounds per square inch (PSI).
What are three other measurements that pressure may also be measured in? (excluding the two most common types).
Hectopascals (hPa).
Millibars (mB) (one millibar = one hectopascal).
Inches of Mercury (Hg).
When air pressure is being measured, the pressure can be referenced to as?
- an atmospheric pressure, where the pressure measured is the difference between two values (differential pressure).
- a vacuum, where the pressure is known as an absolute value.
1,000 feet is how many metre?
304.8 or 305
