Metrics Trix

The SI systemInternational systemSystème international d'unités

A measurement system provides quantitative dataQuantitative means a number is used. You

are measuring a quantity.

Qualitative data:It turned redIt is coldIt started steamingYou are measuring a quality

Basic unitsLinear measurement: meterMass: gram, but Kg is the standardVolume: literTime: secondTemperature: degrees CelsiusAbsolute temperature: Kelvins

Approximations 5 miles is about 8 KmMeter is about a yard2.54 cm = 1 inch1 paper clip is about 1 gram22 pounds = 10 Kg1 liter is about 1 quart3.7 L = 1 gal

KHD_dcm

Best unitsMost sensible numberBest accuracy

Types of measurementsDirectIndirect