1 / 10

Right tools for the right job

Right tools for the right job. Write down the names of these items found in the lab. Equipment and Measurement. Scientific Measurement . Rules for measurement: all units must : All measurements must have a unit For example, yards or feet Be common

ziva
Download Presentation

Right tools for the right job

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Right tools for the right job Write down the names of these items found in the lab

  2. Equipment and Measurement

  3. Scientific Measurement • Rules for measurement: all units must : • All measurements must have a unit • For example, yards or feet • Be common • It must be measured in unit that people know like feet • Be common to everyone • Places like Japan and Germany do not use our system of measurement, they use the metric system.

  4. Right tools for the right job Sometimes you will notice a meniscus: a curving of the surface of the liquid.

  5. Two Systems • We have two systems for measuring: • International System (used all over the world) ex. Meter, grams • US Customary System (mainly used in America) ex. Foot, inch • How do they compare?1 inch = 2.54 cm 1 lb = 0.453kg 3.281 feet = 1 meter 33.8 fl oz = 1 L 0.035 oz = 1 gm 1 gal = 3.78 L

  6. Temperature • SI unit for temp is Kelvin • The metric is Celcius • The English is Fahrenheit • We can convert Celcius to Fahrenheit and to Kelvin • 212 degrees F = 100 degrees C = 373.15 K • This is the boiling point of water

  7. Changing the Magnitude The Metric system or SI is based on units of 10.

  8. So how do I change units?? You multiply when changing from a larger unit to a smaller unit. And you divide when changing from a smaller unit to a larger unit. For example: If you have a bowling ball with a mass of 4.54 kg. If you wanted to convert it to grams, you would have to move 3 spaces on the table to the right. Each space represents a multiplication of 10. So 10 X 10 X 10 = 1000. So, you multiply by 1000. 4.54 kg X 1000 = 4540 g.

  9. Another example A soda can has a volume of 355 mL and you want to convert it to dL. Move two places to the left, so 10 X 10= 100. You divide by 100. 355 mL/ 100= 3.55dL

  10. Precision and Accuracy • Accuracy: how correct a measurement is • For example, if you measure a room as 16.7 feet but a blueprint of the room says it is 16.1, that would be inaccurate. • Precision: how small a scale is being used to make a measurement . For example a measurement made to the nearest 1/8 of an inch is more precise than a measurement that is rounded to the nearest inch • Estimate: a judgement

More Related