Significance in Measurement How to make a measurement from an instrument… How to make a measurement from an instrument… Write down all the digits that you can read directly from the instrument. Write down all the digits that you can read directly from the instrument. Make one guess on the next digit (this is an estimated digit). Make one guess on the next digit (this is an estimated digit).

Significance in Measurement

For each of the rulers, give the correct length measurement for the steel pellet For each of the rulers, give the correct length measurement for the steel pellet

Significance in Measurement

A temperature of 17.00°C was recorded with one of the three thermometers to the left. Which one was it? A temperature of 17.00°C was recorded with one of the three thermometers to the left. Which one was it?ABC

Significance in Measurement Use the bottom of the meniscus (the curved interface between air and liquid) as a point of reference in making measurements of volume in a graduated cylinder, pipet, or buret. Use the bottom of the meniscus (the curved interface between air and liquid) as a point of reference in making measurements of volume in a graduated cylinder, pipet, or buret. In reading any scale, your line of sight should be perpendicular to the scale. In reading any scale, your line of sight should be perpendicular to the scale. mL

Significance in Measurement mL

Determine the volume readings for the two cylinders to the right, assuming each scale is in mL. Determine the volume readings for the two cylinders to the right, assuming each scale is in mL.

How do we know if something is accurate? Instead of measuring error, we measure “percent error” Instead of measuring error, we measure “percent error” % error can be calculated based on a number found experimentally vs. the correct number % error can be calculated based on a number found experimentally vs. the correct number % error = x 100 Experimental - Accepted Accepted