units of measure mini-math camp. scientists across the world use the international system of units...

Units of Measure

Mini-Math Camp

Scientists across the world use the International System of Units (SI).

The International System of Units

Length meter m Mass kilogram kg Time second s Amount of substance mole mol Thermodynamic temperature Kelvin K Electric current amperes amps Luminous intensity candela cd

Quantity Name Symbol

Instruments for Measuring Volume

Graduatedcylinder Syringe

Volumetric flaskBuret Pipet

Beaker,

A beaker does not measure as precisely as a graduated cylinder or pipet. It should be used for approximate measure of liquid volume only.

When reading the volume of liquid in a graduated cylinder or pipet, you always take the reading at the bottom of the meniscus.

The meniscus is the curved surface of the liquid.

To find the volume of an irregularly shaped object, you should:

1. Partially fill a graduated cylinder with water.

2. Record the volume.

3. Place the object in the cylinder.

4. Record the volume.

5. Subtract the initial volume from the final volume to get the volume of the object.

(initial level)

#1. What is the volume of liquid in this graduated cylinder?

Answer: 74.0 mL

#2. What is the volume of liquid in this graduated cylinder?

Answer: 127.0 mL

#3. How many grams are measured on this triple beam balance?

Answer: 125.00 g

Released TAKS Question:Copyright © and trademark ™ 2000.All Rights Reserved.

The pipet is graduated and the most precise.

A test tube is not used for measuring.

A beaker is graduated but not very precise.

The Florence flask is not graduated.

Released TAKS Question:Copyright © and trademark ™ 2000.All Rights Reserved.

The Original Metric Reference

H2O = 1 liter

Volume

1 kg

H2O = 1 kilogram

Mass

1/10 m

1/10 m

1/10 m

Earth = 1 meter

Length

1/10,000,000

The Official Standard Meter

The Official Standard Kilogram

Explain why it’s important for scientists around the world to use the same system of measurement.