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Measuring
How to be
PRECISE and ACCURATE
How to Measure MASS
MASS – the amount of MATTER in an object; measured in grams (gm)
Triple Beam Balance
• Place an object on the pan.
• Slide the rider with the largest mass along its beam until the pointer drops below zero.
• Move it back one notch.
• Repeat the process on each beam until the pointer stays at zero.
• Add the masses on each beam to find the mass of the object.
How to Measure VOLUME
(Liquid Volume) – The amount or liquid; measured in milliliters (ml)
Graduated Cylinder
• A meniscus is the curve of the surface of the water in a graduated cylinder.
• Water "sticks" to the walls of the graduated cylinder, but only on the sides and not the middle.
• When you look at the surface, the water level is not straight – it’s curved like a smile.
• Measurement should be at the BOTTOM of the meniscus.
• Read the meniscus at eye level in to get an accurate reading. read the meniscus at eye level.
Read the volume here
How to Measure LENGTH
• Most metric rulers have lines indicating centimeters and millimeters.
• The centimeter lines are the longer, numbered lines.
• The shorter lines are millimeter lines. • When you use a metric ruler, line up the
0-centimeter mark with the end of the object being measured.