Page 18 - Science Course 1 (Book 1)

MEASURING IN SCIENCE Mo. 1 - L2a What is the International System
Lesson 2 of Units(SI)

International System
of Units (SI)
In this topic, you will learn the following the internationally accepted
lessons: system of measurement.

Mo. 1 - L2a What is the International System
of Units (SI)?
Mo. 1 - L2b What are Precision and Accuracy? Let’s Begin
Mo. 1 - L2c What are Tools Used by Scientists?
A description is a spoken or written summary of
observations.
Mo1-L2a What is the International System?
of Units (SI) An explanation is an interpretation of
observations.
KEY CONCEPTS: When you explain something, you try to interpret your
1. Why did scientists create the International System observations, which can lead to a hypothesis.
of Units (SI) ?
1. Ask a Question
Vocabulary A-Z What do you want to know about?
Why do you want to know it?
Let us learn some vocabulary
2. Research your question
Has anyone asked it before?

Description 3. Perform a Hypothesis
(hi-pot-the-siz):
a spoken or written summary of observations. What do you think is the anwer to your
question? Can you test it?
Do liquids take the shape of a container?
I poured some orange colored liquid 4. Test your Hypothesis
into different glass containers. (hi-pot-the-siz):
I observed that the water has no shape Design and Perform an Experiment Record your
on its own. I also observed the thicker Data.
glass container made of the orange 5. Analyze your Data
liquid look darker and then thinner containers made See if your Data matches your Hypothesis
it look lighter. The orange liquid also looks different
from different angles when looking at it.
6. Draw Conclusions
What did you learn?
Was your Hypothesis correct?
What questions do you have now?
Explanation
Directions: On the line before each question or statement, write the letter of the correct answer. Is an interpretation of observations. The International System of Units

Do liquids take the shape of a
container? Different systems of measurements used in different
I poured some orange colored liquid parts of the world can cause confusion when people
into different glass containers. who use them try to communicate their
I observed that the water has no measurements.
shape on its own. I also observed the
thicker glass container made of
the orange liquid look darker and then thinner contain-
ers made it look lighter. The orange liquid also looks
different from different angles when looking at it.
Water has no shape. It only takes the shape of the
container it is in.

The International System of Units (SI) is the
internationally accepted system of measurement.

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