2.2 Units Flashcards
a collection of compatible, related units that can be used to measure such quantities as length, mass, weight, or volume
system of measurement
one of the earliest units of measurement; originally based on the length of a person’s arm from the elbow to the tip of the middle finger
cubit
a specific measure to which other measures are compared to ensure uniformity
standard of measure
kilo-
1000
the coldest possible temperature
absolute zero
the technique used to convert a measurement in one unit into a different unit without changing the value of the measurement.
dimensional analysis
Why must measured data include units?
units make the data meaningful
What is the name of the standard system of measurement universally used and accepted by scientists?
SI (International System of Units)
SI base units of length
meter
SI base units of mass
kilogram
SI base units of time
second
What temperature scale is used in most nations of the world?
Celsius
What absolute temperature scale is used by scientists?
Kelvin scale
What is absolute zero on the Celsius scale?
-273.15º
Formula for converting Celsius to Fahrenheit
Formula for converting Fahrenheit to Celsius
Formula for converting Celsius to Kelvin
Formula for converting Kelvin to Celsius
