Units of Measurement 〉 How do scientists measure things?

MeasurementMeasurement uses numbers to describe processes and events Metrology is the study of measurement. This term comes from the Greek words metron which means “measure” and logos which means “study of.” Metrology

4 Common Measurements length: a measure of the straight-line distance between two points – Base Unit – Meter - m mass: a measure of the amount of matter in an object – Base Unit – Gram - g weight: a measure of the gravitational force exerted on an object – Base Unit – Newton - N volume: a measure of the size of a body or region in three-dimensional space – Base Unit – cubic centimeter – cc or cm 3 or ml

Volume

The International System of Units is known as SI from its French name Systeme International d’Unites. SI units are the current world standard for measurement. There are seven basic SI units. They are the meter, kilogram, second, ampere, kelvin, mole, and candela.

SI (Le Système Internationale d’Unités)

Conversions Common Conversions 100 cm = 1 m 1000 m = 1 km 1000 mm = 1 m 1 km = 0.62 mi 1 kg = 2.2 lbs 1 hr = 60 min 1 min = 60 s 3600 s = 1 hr

Conversions Convert your mass in lbs to kg.

1 step – conversions 1000 cm = ? m 45 mg = ? g 800 kL = ? L 200 lbs = ? Kg – 1kg = 2.2 lbs

2 step - conversions 100 cm = ? km 8 kg = ? cg 4500 g = ? Lbs 50 m 2 = ? cm 2

Complex Conversions 10 m/s = ? mi/h 1200 cg = ? Lbs 5 cm 3 = ? m 3

Conversion Practice 45 mg = ? g 800 L = ? cL 8 km = ? m 5 miles = ? km 0.62 miles = 1 km

Common Metric – English Conversions Length – 1 in. = 2.54 cm – 1 m = ft – 1 yd = m – 1 km = 0.62 mi Volume – 1 L = 1.06 qt – 1 ml = 1cm^3 Mass – 1 kg = 2.2 lbs – 1000 kg = 1 t (metric ton) Force – 1 lb = 4.48N Time – 365 days = 1 year – 1 day = 24 hr – 1 hr = 60 min – 1 min = 60 s – 3600 s = 1 hr