Methods: Mesurment And Metric System Flashcards
Caliper and parts
Middle is cm scale, and part on outside vernier scale
Use: put thing measuring in jaws. Where 0 of vernier scale is on cm scale is first 2 digits. (Ex. 3.2 cm) first line on vernier scale that matches up w/ line on cm scale is next 2 digits (ex. 60) (final measure = 3.260 cm) always 4 digits, do not omit 0s b/c indicates precision
Uncertainty:
Least count:
Tare
Zero out a scale
Say had water in bucket and wanted to get weight of just water and not bucket. Put bucket on scale and zero out so bucket’s weight not included in measurement. Add water. Final measurement will be only of the water.
Metric length
Meters (m)
Metric volume
Liters (liquid)
Metric mass
Grams (g)
Least Count (LC)
Difference of 2 consecutive marks on ruler
First best guess (FBG)
Measurement with one more place value than LC, estimation
If can mentally divide space between to ticks in half, next estimated digit 5 or 0
Can mentally … ‘’ … into 5 parts, next digit 0, 2, 4, 6, 8
‘’ into 10 parts: next digit 1234567890
Uncertainty
Amount FBG could be wrong
Could mentally divide into 5 parts +- …2 (unit)
Etc
(EX; +- 0.005 cm)
+/- sig fig rules
Number with highest smallest place value sig fig in number is weakest link so go to that place value
(Ex. 2.042 + 2.36=4.402=4.40
*// sig fig rules
with least amount of sig figs is weakest link so answer has that many sig figs.
Mass
Amount of matter something has
Volume
Amount of space something takes up
Density
Amount of matter in a space (D=M/V)
Object property
Any property of something that can be measured
Substance property
Physical: observed w/o chemical change
Chemical: observed w/ chemical change
