Theme 5 - Converting Units of Measurement Flashcards
(18 cards)
What is measurement in the context of physical characteristics?
Numerical measurements of a physical characteristic e.g.- length, speed, current etc.
Measurement is the process of obtaining the magnitude of a quantity.
What are units used for?
To quantify what something is measured by
Units provide a standard for measurement, making it easier to communicate and compare values.
Define precision in measurements.
How well the measurement is made, how close the measurements are to each other
Precision is influenced by the quality of measuring equipment.
What is accuracy in measurements?
How close the measurement is to the actual value
Accuracy can be affected by human error.
List the seven base SI units.
- Length: meter (m)
- Mass: kilogram (kg)
- Amount of substance: mole (mol)
- Time: second (s)
- Electric Current: ampere (A)
- Temperature: kelvin (K)
- Luminous Intensity: candela (cd)
These units form the foundation of the International System of Units (SI).
What are the two supplementary SI units?
- Plane Angle: radian (rad)
- Solid Angle: steradian (sr)
Supplementary units complement the base units in the SI system.
What is the SI unit for force and its base unit form?
Newton (N)
Form in base units: kg ⋅ m ⋅ s−2
Force is defined as mass times acceleration.
What is the SI unit for energy and its base unit form?
Joule (J)
Form in base units: N⋅m
Energy is the capacity to do work.
What is the SI unit for pressure and its base unit form?
Pascal (Pa)
Form in base units: J ⋅ m−3
Pressure is defined as force per unit area.
What is the SI unit for power?
Watt (W) or V⋅A
Power measures the rate of doing work or transferring energy.
Fill in the blank: The SI unit for area is _______.
square meter (m²)
Area is calculated as length multiplied by width.
Fill in the blank: The SI unit for volume is _______.
cubic meter (m³)
Volume measures the amount of space an object occupies.
What is the SI unit for speed and its base unit form?
Meter per second (m ⋅ s−1)
Speed is the distance traveled per unit time.
What is the SI unit for acceleration?
Meter per second squared (m ⋅ s−2)
Acceleration is the rate of change of velocity.
What is the SI unit for density?
Kilogram per cubic meter (kg ⋅ m−3)
Density is mass divided by volume.
Fill in the blank: The prefix for 10^9 is _______.
giga (G)
Giga is a metric prefix indicating a factor of one billion.
List the prefixes for 10^6, 10^3, and 10^2.
- 10^6: mega (M)
- 10^3: kilo (k)
- 10^2: hecto (h)
These prefixes are used to express multiples of units.
Fill in the blank: 1 mL is equal to _______.
1 m³
This conversion indicates the relationship between milliliters and cubic meters.
