Lab Equipment. Beaker Beakers hold solids or liquids and used for stirring and heating.
Measurement. Stretch your mind: You are given a bottle of water and 3 beakers. One of the beakers...
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Transcript of Measurement. Stretch your mind: You are given a bottle of water and 3 beakers. One of the beakers...
Measurement
Stretch your mind:
You are given a bottle of water and 3 beakers. One of the beakers holds 30mL, one holds 40mL, and the largest of the three beakers holds 200mL when full. There are no markings on any of the beakers.
How can you put 20mL of water in the largest beaker without using any other equipment?
Tools of the TradeWhat measuring instrument can be used to determine the following?
how much cloth a tailor needs for a pair of pants
how long you should boil the egg
whether or not you have a fever
how much cough syrup you should take
how much flour should be added to the batter
7 Base (Fundamental) QuantitiesBase
QuantitySI Unit
length meter (m)mass kilogram (kg)time second (s)
electric current ampere (A)temperature kelvin (K)
amount of substance mole (mol)luminous intensity candela (cd)
* The base quantities are assumed to be mutually independent.
Take from NIST website
Some Derived Quantities
Derived Quantity
SI Derived Unit
area square meter (m2)
volume cubic meter (m3)
density kilogram per cubic meter (kg/m3)
speed, velocity meter per second (m/s)
acceleration meter per second squared (m/s2)
force, weightkilogram meter per second squared
(kg⋅m/s2)or newton (N)
energy newton meter (N⋅m) or joule (J)
Take from NIST website
Tools of the Trade
Metric Prefixes
Take from NIST website
The METRIC SYSTEM
Precision and Accuracy
What is precision?
What is accuracy?
How do we obtain precise and accurate measurements?
Writing Measurements
number + unit
In every measurement, there should be a...
•Precision of instrument = smallest calibration or finest division•In writing measurements, always include the estimated digit!
how much there is of something standard we are comparing the value to
Let’s Practice!Give the measurement reading:
Let’s Practice!Give the measurement reading:
Let’s Practice!Give the measurement reading:
Let’s Practice!Give the measurement reading:
Let’s Practice!Give the measurement reading:
in degree Celsius