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## PowerPoint Slideshow about ' Daily Science (pg. 4)' - chenoa

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### Mechanics of measurement (pg. 9)

Daily Science (pg. 4)

- Go through the bucket on your station and see how many things you can identify.

Lab Map (page 7)

- Sketch a map of the lab and label the following:
- First aid kit
- Fire extinguisher
- Fire blanket
- Cabinets (volumetric flasks, funnels, graduated cylinders, beakers, Erlenmeyer flasks)
- Sinks/ gas outlets
- Aprons
- Goggles
- Broken glass box
- Eye wash

Science is only as good as the instrument that measures it

Accuracy vs. Precision

- Accuracy- how close you are to the ‘true’ measurement.
- Precision- how close your measurements are to each other.

How to read a scaled device

- Step 1: Determine the intervals used on the scale. (Is it counting by ones, tens, fives, etc.?)
- Step 2: Record the measurement and then record one more number.
- The last number is always uncertain, but its in the ball park

Recording Measurement Worksheet

How would you read this?

1. What is it counting by?

Ones

2. What it the measurement?

23

3. What is the uncertainty number?

23.0

Graduated cylinder

Always read the bottom of the meniscus at eye level.

Read at the bottom of the meniscus

How to use a mass scale

- Make sure it is on and the lid is UP.
- Zero the balance before you mass
- NEVER put chemicals directly on the plate

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