Chapter 2 Resource: Measurement - Learning Services Home

More documents

Recommendations

Info

Name Date Class 1 Enrichment Weather Instrument Precision The symbol ± is used to show precision in measuring devices. For example, ±3°C means that the actual temperature may be 3°C greater or 3°C less than the temperature shown on the instrument. Max/Min Thermohygrometer ■ Digitally displays relative humidity and temperature ■ Measures relative humidity (RH) from 25% to 95% with precision +5%RH ■ Measures temperature 0°C to 50°C with precision +2°C Meeting Individual Needs Battery Operated Hygrothermograph ■ Measures relative humidity and temperature and records them on a chart ■ Measures relative humidity from 5% to 99% with +3% RH precision ■ Measures temperature from −10°C to 50°C with +1°C precision 1. Describe ways these two instruments are alike. 2. Describe the differences between these two instruments. 3. How precise are the measurements for each instrument 4. If the display on the thermohygrometer shows 15°C, between what temperatures might the actual temperature fall How do you know 5. Suppose the thermohygrometer shows 52% relative humidity and at the same time the hygrothermograph shows 55% relative humidity. What would you expect to be the actual relative humidity Copyright © Glencoe/McGraw-Hill, a division of the McGraw-Hill Companies, Inc. 26 <strong>Measurement</strong>
Name Date Class 2 Enrichment Defining the Meter Over the years, scientists have used different ways to set the exact length of the meter. In 1790 it was suggested that the meter be defined as the length of a pendulum having a period of one second. In 1791 it was proposed that the meter equal one ten-millionth of the distance at sea level from the north pole to the equator. In 1799 a platinum bar one ten-millionth of the length of the part of the meridian that reached from the north pole through Paris to the equator was created as the prototype for the meter. This bar, the Metre des Archives, was one meter long from end to end at 0°C. In 1889 a meter bar made of platinum and iridium and measured at 0°C became the standard. In 1960 a definition based on the wavelength of krypton-86 radiation in a vacuum was instituted. The definition changed again in 1983, when the current definition was established. A meter is now defined as the length traveled by light in a vacuum in 1/299,702,458 of a second. 1. What other unit needed to be standardized before the meter could be defined under the 1983 definition Meeting Individual Needs 2. What are some possible problems with using a physical model as a prototype Copyright © Glencoe/McGraw-Hill, a division of the McGraw-Hill Companies, Inc. 3. Why was it necessary to specify a particular meridian when determining the length of a meter 4. How precise is an everyday meterstick compared to the length of the standard meter <strong>Measurement</strong> 27
Page 1 and 2: Glencoe Science Chapter Resources M
Page 3 and 4: Reproducible Student Pages Reproduc
Page 5 and 6: Name Date Class Measuring Accuratel
Page 7 and 8: Name Date Class Scale Drawing Lab P
Page 9 and 10: Name Date Class Design Your Own Pac
Page 11 and 12: Name Date Class Copyright © Glenco
Page 13 and 14: Name Date Class Copyright © Glenco
Page 15 and 16: Name Date Class Measurement Directi
Page 17 and 18: Name Date Class Directed Reading fo
Page 19 and 20: Copyright © Glencoe/McGraw-Hill, a
Page 21 and 22: Nombre Fecha Clase Lectura dirigida
Page 23 and 24: Copyright © Glencoe/McGraw-Hill, a
Page 25 and 26: Name Date Class 1 Reinforcement Des
Page 27: Name Date Class 3 Reinforcement Dra
Page 31 and 32: Name Date Class Note-taking Workshe
Page 34 and 35: Assessment Assessment 32 Measuremen
Page 36 and 37: Name Date Class Chapter Review (con
Page 38 and 39: Name Date Class 1 Section Focus Tra
Page 40 and 41: Name Date Class 3 Section Focus Tra
Page 42 and 43: Name Date Class Teaching Transparen

Chapter 2 Resource: Measurement - Learning Services Home

Create successful ePaper yourself

Delete template?

Save as template?