Measurement and Metrics 1 2 3 What makes

Measurement and Metrics 1. 2. 3. What makes the metric system different than other systems? What are the benefits of a standardized measurement system? What are the metric prefixes?

Measurement and Metrics �Standardized System International System of Units (SI units) �Quantitative not Qualitative �A universal way to communicate scientific data

Common Types of Measurement �Length �Volume �Mass �Temperature �Time

Standardized Values �What is a Meter? One ten-millionth the distance from North Pole to equator? 1, 650, 763. 73 wavelengths of reddish orange light given off by krypton Distance light travels in a vacuum in 1/299, 792, 458 of a second

Metric System Prefixes �Describe the size of the measuring unit compared to the standard unit �Based on multiples of ten.

Metric System Prefixes Prefix Symbol Factor Number Factor word Mega M 1, 000 One Million Kilo K 1000 One thousand hecto h 100 One hundred deca da 10 Ten BASE UNIT (meter, liter, gram) 1 deci d 0. 1 One tenth centi c 0. 01 One hundreth milli m 0. 001 One thousandth 0. 000001 One millionth micro

Metric System Prefixes � Imaginary Unit- Dweeble � Kilo dweeble � Hecta dweeble � Deca dweeble � Deci dweeble � Centi dweeble � Milli dweeble � How much dweeble have you got? � 1000 dweebles � 10 dweebles � One dweeble � 1/1000 dweeble

Length � Distance between two points � Metric Base Unit Meter (m)

Volume � The space occupied by an object or substance � Metric Base Unit Liters

Measuring Liquid Volumes � Measure using the best device possible � Beakers, Erlenmeyer flasks, graduated cylinders � Measure to the BOTTOM of the Meniscus

Volume by Displacement (Indirect measurement) � Irregular Objects All objects take up space Determine by adding to a known volume of liquid Displacement of liquid = space taken up by the object

Say what? ! � 1 cm 3 = 1 cc = 1 m. L

Mass � The amount of matter in an object or substance � Weight ≠ Mass � Measure with a scale or balance � Metric Base Unit Gram (g)

Metric Temperatures � Measured in Kelvin OR degrees Celsius � 100 o. C=boiling � 37 o. C= body temperature � 20 o. C= room temperature � 0 o. C= freezing

Relationships Among Metric Units Rate is the amount of change over time. DISTANCE ____ = Rate of distance change (SPEED) TIME Ø Example Units: km/hr m/ s TEMPERATURE _______ = Rate of temperature change TIME VOLUME _____ TIME = Rate of volume change

Relationships Among Metric Units � Density is the amount of matter in a specific area or volume MASS ____ = DENSITY VOLUME Ø Example Units: g/m. L kg/ L g/cm 3

On Volume and Mass of water � 1 m. L of water weighs 1 gram!! � 1 Liter of water (at 20 degrees celsius ) weighs 1 Kilogram!!