SI Units and Measurements

Lab Equipment &

Measurement

●
Understand how to take
accurate measurements

Objective

When measuring length, first find the “0” in your ruler or measuring tape.
You should line up your object with the zero.

Measurement: Length

Extend your object straight over the ruler or measuring tape. Check your
units, in science we always use metric units, in this case centimeters (cm).

Record you rmeasurement

including decimal points

and units.

In this example: 5.3 cm

Measurement: Length

Multiple Choice

What SI unit is used to measure length?

• meters

• liters

• centimeters

• kilograms

Multiple Choice

What is the length of the straw?

• 8 cm 
• 0 cm 
• 7 cm 
• 1 cm 

Multiple Choice

What is the length of the red bar?

• 23 mm or 2.3 cm
• .23 mm or 2.3 cm
• 230 mm or 2300 cm
• none of the above

When measuring a liquid we can use
a graduated cylinder. Transfer your
liquid into a graduated cylinder.
Observe at eyesight level.

You will see a curve in the liquid, this
is the meniscus. You will take the
measurement from under the
meniscus.

Measurement: Volume

To measure the volume of an
irregular object first place water in
your graduated cylinder. The water should be enough to cover your object. Record the volume.

Then insert your object into the graduated cylinder. Record the volume.

Finally subtract the volume of water,
to the volume of water + object, this
is the volume of your object.

Measurement: Volume

Multiple Choice

What is this?

• Balance
• Triple beam balance
• Mass
• Graduated cylinder

Multiple Choice

How much water is in the graduated cylinder

• 40
• 30
• 35
• 36

Tools to measure volume accurately are;

​-Graduated cylinders
-Pipettes
-Burets
-Volumetric Flasks

Multiple Choice

Students filled a graduated cylinder with the amount of water shown. How much more water needs to be added to the cylinder to measure 25 mL?

• 2 mL
• 4 mL
• 6 mL
• 9 mL

Measurement: mass

To measure the mass, first put your
object on the plate. Then adjust the
poise (see image above) starting by
the smallest, and moving up, you
might need to go back to the smaller
ones later.

Move the poises until it is balanced at
zero.

Add the measurement to complete
your measurement.

Measurement: Mass

Multiple Choice

What is the mass on the triple beam balance?

• 439.0
• 437.2
• 437.0

Multiple Choice

How much weight is on this triple beam balance?

• 272 g
• 272.5 g
• 270 g
• 372 g

Measuring Temperature

1.
Submerge the bottom of the thermometer,
called the bulb, in the liquid to be measured.
Ensure that the bulb does not touch or get close
to any other material such as the sides or bottom of the fluid container; if it does, the thermometer
will be measuring the combined temperature of
more than one object, rather than the
temperature of the substance of interest.

Measuring Temperature

2. While holding the thermometer steady, give
the red liquid time to rise, fall, or stay at the
same level. An analog thermometer takes time to
adjust to its surroundings. Before we can read
out the measured temperature, the height of the
red liquid must not be changing at all.

Measuring Temperature

3. Holding the thermometer upright, we set our vision level
with the top of the red liquid. We avoid looking up or down at
the top of the liquid, because that can trick our eye into
seeing an incorrect level and recording an incorrect
temperature.

Multiple Choice

What temperature does the thermometer show?

• 16 °
• 12 °
• 13 °
• 14 °

Multiple Choice

What measurement are we finding when we use a balance?

• mass
• volume
• length
• weight

Multiple Choice

A STUDENT CAUGHT A GRASSHOPPER AND WANTED TO KNOW HOW LONG IT WAS. WHICH TOOL IS BEST TO MEASURE THE LENGTH OF THE GRASSHOPPER?

• RULER
• PAN BALANCE
• ELECTRONIC SCALE
  
• THERMOSTAT

Multiple Choice

The SI unit for time is the __?__.

• hours (h)

• liter (L)

• gram (g)

• second (s)

Multiple Choice

What measurement are we finding when we use a graduated cylinder?

• mass
• volume
• length
• weight 

Multiple Choice

What would be a quantitative observation?

• There were 5 pumpkins.

• The pumpkins were orange.

• The pumpkins were shiny.

• The pumpkins smelled sweet.

Multiple Choice

Using your senses to gather information

• Inferring

• Observing

• Classifying

• Evaluating

Multiple Choice

The mass of the beaker was 122 grams.

• Qualitative

• Quantitative

Multiple Choice

What prefix is represented by the following symbol: m

• hecto

• kilo

• milli

• mega

Multiple Select

Read each statement. Check all boxes that are an observation.

• I see snow falling

• fourteen students are working on the experiment.

• The unhealthy plant must not have been given fertilizer.

• The water is 22 degrees.

Multiple Choice

Which observation is qualitative?

• Rain is falling

• It rained 6 cm.

Multiple Choice

The flower is red.

• Qualitative

• Quantitative

Multiple Choice

What is the symbol for the prefix kilo-?

• L

• m

• k

• kg

Multiple Choice

The candy was sour.

• Qualitative

• Quantitative

Multiple Choice

She has 3 sisters.

• Qualitative

• Quantitative

Multiple Choice

The bug was 5 cm long.

• Qualitative

• Quantitative

Multiple Choice

The SI units of science are based on the __________ system

• Emperical

• Standard

• Metric

• Science

Multiple Choice

What tool can you use to find out how the mass of a pencil compares to the mass of a pen?

• balance
• meter stick
• thermometer
• measuring tape
  

Open Ended

Mention one science skill and why it is important.

Multiple Choice

Which observation is quantitative?

• Rain is falling

• It rained 6 cm.

Multiple Choice

If you were in science class, what would you report as the temperature on this thermometer? (click on the image to zoom in)

• 70 degrees C
• 70 degrees F
• 20 degrees C
• 20 degrees F

Multiple Choice

What tool can you use to find out how the mass of a pencil compares to the mass of a pen?

• electronic scale

• meter stick

• thermometer

• measuring tape

Multiple Choice

What temperature does the thermometer show?

• 16 °
• 12 °
• 13 °
• 14 °

Multiple Choice

When measuring temperature we use what in science class?

• Fahrenheit
• Celsius
• Kelvin
• None of the above

Multiple Choice

If I have 42 millimeters how many centimeters does that equal?

• 420 cm
• 4.2 cm
• .42 cm
• none of the above

Multiple Choice

What does this tool measure?

• speed
• density
• volume
• length

Multiple Choice

What does this tool measure?

• temperature
• height
• weight
• distance

Multiple Choice

Units used to measure Mass of an object

• Centimeters
• Milliliters
• Grams
• Volume

Multiple Choice

What is the name of this tool?

• Triple Beam Balance

• Electronic Scale

• Food Scale

• Spring Scale

Multiple Choice

What would be a qualitative observation?

• There were 5 pumpkins.

• The pumpkins were orange.

• There was 1 pumpkin in oil.

• There was 1 pumpkin in milk.

Multiple Choice

Which of the following is a unit of mass?

• kilogram
• liter
• meter
• pound

Multiple Choice

Based on the photo, what is the volume of the liquid?

• 35 mL

• 24 mL

• 25 mL

• 30 mL

Multiple Choice

Which of the following is a METRIC unit of measure for MASS?

• mL

• oz.

• kg

• cm