The SI system International system Système international d'unités.

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Presentation transcript:

The SI system International system Système international d'unités

A measurement system provides quantitative data Quantitative means a number is used. You are measuring a quantity. Qualitative data: It turned red It is cold It started steaming You are measuring a quality

Basic units Linear measurement: meter Mass: gram, but Kg is the standard Volume: liter Time: second Temperature: degrees Celsius Absolute temperature: Kelvins

Approximations 5 miles is about 8 Km Meter is about a yard 2.54 cm = 1 inch 1 paper clip is about 1 gram 22 pounds = 10 Kg 1 liter is about 1 quart 3.7 L = 1 gal

KHD_dcm

Best units Most sensible number Best accuracy

Types of measurements Direct Indirect