Many laboratory activities require measurements. Science uses the S.I. (Metric System) of measurements.
Types of measurements: –Linear (length or distance) –Mass (weight) –Volume –Temperature
All measuring instruments have calibrations. These are the markings or divisions on the measuring tool.
Linear measurements are made using a Meter Stick or Metric Ruler. Metric Ruler Meter Stick
The basic unit for linear measurement is the meter (m.). Other commonly used units are the centimeter (cm.) and millimeter (mm.). One advantage of the metric system is that everything is based on the number, 10, or some multiple of 10. 10 mm. = 1 cm. (and 1 mm. = 0.1 cm.) 100 cm. = 1 m. (and 1 cm. = 0.01 m.) Also, 1000 m. = 1 kilogram (kg.).
COMMON PROCEDURES Techniques used for various Activities
FILTRATION Purpose and Definitions Used to separate suspensions. Filtrate is the liquid portion which passes through the filter paper. Residue (precipitate) is the portion which remains in the paper.
1. Fold a circular piece of filter paper into quarters to form a cone. 2. Insert into a funnel and dampen