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# Phys Chap 3

Measurement a comparison of a dimension of an object or substance to an appropriate standard, usually a calibrated scale
Dimension a property that can be measured like length, mass
Standard a known quantity
Instrument Like thermometer, scale, meter stick used to make measurements
Unit the segment of a dimension assigned the value of 1
Calibrated scale the size of the unit determines the spacing of the marks on the instrument
Data information collected from a scientific observation
Qualitative data word descriptions, like color, texture
Quantitative data a measured numerical amount that has a number AND unit
SI System International d'unit -- metric units
SI unit of length meter
SI unit of mass kilogram
SI unit of time seconds
SI unit of volume Liter
SI unit of temperature Kelvins
Symbol of meter m
Symbol of seconds s or sec
Symbol of Liter L
Symbol of Kelvins K
Symbol of Kilogram Kg
Bridge notation or conversion factors used to convert units
Accuracy evaluates how close the measurement is to the actual value
Precision How exactly the measurement if made. The more decimal places the more exact.
Mass is measured on electronic scales or triple beam scales
Volume is measured with graduated cylinders
Length is measured with rulers or meter sticks
If a quantity is defined or counted it has infinite precision and sigfigs are not applicable
If a number has no unit what are not applicable? sigfigs
significant figures all the measured amounts plus one estimated place on an instrument
Kilo means 1000
centi means 1/100
deci means 1/10
milli means 1/1000
Giga means billion or 1 000 000 000 or 10^9
Mega means million or 1 000 000 or 10 ^6
Micro means 1/1000 000 or 1 millionth or 10^-6
nano means 1/1000 000 000 or 1 billionth or 10^-9
This indicates the amount of matter in an object as gravity pulls down on it weight
Weight is measured in Newtons
Hecto means 100
This is all the matter in an object mass
weight is measured using a spring scale
1 centimeter cubed ( cm^3) is cc
1 cc is the same as 1 mL
Density How compact the particles are in a volume
Law of Mass Conservation Matter is neither created nor destroyed
A way to express very large or very smaller numbers scientific notation
The curved surface of most liquids in a cylinder meniscus
Density = m/v
Created by: kdcribb