Chapter 2: Measuring Matter
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What is often called the language of science and is the science of quantity?
mathematics
What is the term that describes science put to use?
technology
What is an equation?
a set of symbols summarizing a mathematical relationship between quantities
What is the most important part of an equation?
the equal sign
What term is concerned with how closely a measurement reflects the actual value?
accuracy
What refers to the repeatability of a measurement?
precision
What are used to record only measured values and values calculated from measured values?
significant figures
What is scientific notation?
numbers written from expanded form to smaller form
What is a collection of compatible, related units that can be used to measure such quantities as length,mass, weight, or volume?
system of measurement
What was one of the earliest units of measurement?
the cubit
What is a standard of measurement?
a specific measure to which other measures are compared to ensure uniformity
What system of measurement is commonly used in the United States today?
the F.P.S. system
What system uses a prefix attached to the name of each basic unit to make it smaller or larger?
the metric system
The most widely used prefixes are what?
milli-, centi-, and kilo-
What is the SI?
its a modification of the metric system
What is the standard SI unit of length?
the meter
What unit is more commonly used to measure volume?
the liter [metric]
What unit is defined by the SI and is more commonly used in everyday life than the gram?
kilogram
What is the most basic unit of time
the second
How do most nations measure temperature?
by using the Celsius scale
What is the coldest possible temperature?
absolute zero
What is the official temperature scale of the SI?
the Kelvin scale
What is the freezing point of water on the Kelvin scale?
273.15K
what is the technique of converting units?
dimensional analysis