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Scientific Measurement

Scientific Measurement. A review…. The common language of measurements in science used all over the world is the metric system. The metric system is a decimal system or a system based on ten. Length. The meter is the basic unit length. The tool that we use most often is the meter stick.

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Scientific Measurement

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  1. Scientific Measurement A review…

  2. The common language of measurements in science used all over the world is the metric system. • The metric system is a decimal system or a system based on ten.

  3. Length The meteris the basic unit length. The tool that we use most often is the meter stick. Longer distances would be measured in kilometers.

  4. Volume • Volume is the amount of space something takes up • The basic unit of measure for volume is Liters. • Volume conforms to the container that contains it (shape) • The tool that we use to measure liquid volume is called the graduated cylinder. We measure from the bottom of a line called the meniscus. • the meniscus results from water being pulled down by other water molecules – cohesion– and from water being attracted to the side of the container -- adhesion

  5. Liquid Volume is measured in milliliters (mL) or liters (L) • Solid Volume is measured in cubic centimeters (cm3) • For Regular Solid Volume: Length X Width X Height • 2cm X 3 cm X 2cm = 12cm3 • For Irregular volume: (no regular shape) you must use the volume displacement method.

  6. Volume Displacement Method • place a known value in a graduated cylinder ( 7 ml) • place the irregular object into the graduated cylinder • measure the displacement of volume ( where did the liquid move up to) ( 9ml) • Subtract the original volume from the new volume ( 2ml) • Calculate the volume of the object as 2cm3 ( because it is a solid, not liquid)

  7. Mass • the amount of matter in an object (different from weight – weight depends on gravity, mass does NOT!) • The gram is the basic unit of measure • The tools that we use are the triple beam balance, electronic balance, or a scale

  8. Electronic Balance – more precise Triple Beam Balance – counter balance system

  9. Basic Safety • DRESS for lab – closed toed shoes, wear apron, wear eye protection, pull back hair, remove jewelry, keep loose clothes secured (observe ALL above until lab is completely cleaned up for the day…) • Read lab directions IN ADVANCE!!! • Listen to directions and ask if unsure • Stay in lab area assigned • FOLLOW DIRECTIONS, don’t go out on own • NEVER EAT OR DRINK in the lab • If have an accident, spill or breakage, report it immediately and replace needed equipment • CLEAN LAB AREA before leave USE COMMON SENSE!!!

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