Data Collection and Analysis Chapter 1 Data Collection and Analysis

The Metric System The metric system (International System of Units) is used when describing experiments and data. Based on multiples of 10.

Length The basic unit of length is the meter (m)

Metric Units of Length 1 meter (m) = 10 decimeters (dm) 1 dm = 1x10-1 m (1/10) 1 m = 100 centimeters (cm) 1 cm = 1x10-2 m (1/100) 1 m = 1,000 millimeters (mm) 1 mm = 1x10-3 m (1/1000) 1 m = 1,000,000 micrometers (μm) 1 μm = 1x10-6 m (1/1,000,000)

Metric Units of Length 1 m = 1,000,000,000 nanometers (nm) 1 nm = 1x10-9 m (1/1,000,000,000) 10 m = 1 dekameter (dam) 100 m = 1 hectameter (hm) 1000 m = 1 kilometer (km) 1,000,000 m = 1 megameter (Mm) 1,000,000,000 m = 1 gigameter (Gm)

Volume Amount of space an object occupies. Metric Units are the Liter (L) for liquids. Metric Units are cubic centimeters (cc or cm3) for solids.

Mass The amount of matter in an object. Metric measurement is the kilogram (kg). Small objects are measured in grams (g). 1 kg = 1000 g 1g = 1000 mg

Temperature Metric system uses the Celsius scale Water freezes at 0ºC and boils at 100ºC Body temperature is 37 ºC

Time Time is measured in seconds

Accuracy vs. Precision Accuracy = How close a measured value is to the true value. Precision = How close the measured values are to each other. High accuracy, high precision High accuracy, low precision Low accuracy, high precision

Clicker Question Which unit is used in order to measure the mass of an object? Liter meter gram second 

Clicker Question You would like to measure the volume of a spoon full of water. The best metric units to use are mL L kL 

Clicker Question How many cm? 18.2 18.25 19.7 19.75 

Clicker Question How many mm? 18.2 18.25 182.5 1825 

Clicker Question How many m? 18.2 18.25 1.825 .1825 

Clicker Question How many km? 22.55 .2255 .002255 .0002255 

Clicker Question What is the mass? .2246g 2246g 22.46g 224.6g 

Clicker Question What is the mass? .2166g 21.66g 216.6g 2.166g 

Clicker Question What is the mass? 44.6g .446g 4.46g 446g 

Clicker Question What is the mass? 13.3g 1.33g .133g 133g 

Clicker Question What is the volume? 25.2mL 2.52mL 252mL .252mL 

Clicker Question What is the volume? 3.68mL .368mL 36.8mL 368mL 

Clicker Question What is the volume? 54.8mL .548mL 5.48mL 548mL 

Clicker Question What is the volume? 14.9mL 149mL 1.49mL .149mL