Chapter Introduction

Lesson 1 Understanding Science

Lesson 2 Measurement and Scientific Tools

Lesson 3 Case Study

Chapter Wrap-Up

What processes do scientists use when they perform scientific investigations?

• What is scientific inquiry?

• How do scientific laws and scientific theories differ?

• What is the difference between a fact and an opinion?

Understanding Science

• science

• observation

• inference

• hypothesis

• prediction

Understanding Science

• technology

• scientific theory

• scientific law

• critical thinking

• Science is the investigation and exploration of natural events and of the new information that results from those investigations.

• Scientific knowledge is the result of a great deal of debate and confirmation within the science community.

• People use science in their everyday lives and careers.

What is science?

There are three main branches of science—Earth science, life science, and physical science.

Branches of Science

physical

from Latin physica, means “study of nature”

• The study of Earth, including rocks, soils, oceans, the atmosphere, and surface features of Earth, is Earth science.

• The study of living things is life science, or biology.

• The study of matter and energy—including both physics and chemistry—is physical science.

Branches of Science (cont.)

Scientific Inquiry

Scientific inquiry is a process that uses a set of skills when they conduct scientific investigations to answer questions or to test ideas about the natural world.

Scientific Inquiry (cont.)

Scientific inquiries include many possible steps.

• Observation is the act of using one or more of your senses to gather information and taking notes of what occurs.

• An inference is a logical explanation of an observation that is drawn from prior knowledge or experience.

Scientific Inquiry (cont.)

• A hypothesis is a possible explanation for an observation that can be tested by scientific investigations.

• A prediction is a statement of what will happen next in

a sequence of

events.

Scientific Inquiry (cont.)

• Scientists test a hypothesis by doing one or more of these steps: designing an experiment, making a model, gathering and evaluating evidence, collecting data, or recording observations.

• After testing your hypothesis, you analyze your results using various methods.

Scientific Inquiry (cont.)

• Once you find the relationships among data and make several inferences, you can draw conclusions.

• A conclusion is a summary of the information gained from testing a hypothesis.

Scientific Inquiry (cont.)

• An important part of scientific inquiry is communicating results.

• Scientists communicate their results to inform other scientists about their research.

Results of Science

If predictions are correct and the hypothesis is supported, scientists will retest the predictions several times to make sure the conclusions are the same.

Scientific Inquiry (cont.)

• Scientific investigation can have various outcomes, including new technology, new materials, and new explanations as to how or why something happens.

• Technology is the practical use of scientific knowledge, especially for industrial or commercial use.

Results of Science (cont.)

• Another outcome of science is the development of scientific theories and laws.

• If hypotheses have been tested and supported repeatedly by scientific investigations they can become a theory.

• A scientific theory is an explanation of observations or events that is based on knowledge gained from many observations and investigations.

• A scientific law is a rule that describes a pattern in nature.

Results of Science (cont.)

Scientific information constantly changes as new information is discovered or as previous hypotheses are retested.

New Information

• Critical thinking is important in all decision making.

• Critical thinking refers to comparing what you already know with the information you are given in order to decide whether you agree with it.

• Scientists evaluate scientific evidence by using skepticism-doubting the truth or accuracy of statement-and by identifying facts and opinions.

• Scientists realize that not all questions can be studied using scientific inquiry, including those related to opinions, beliefs, values and feelings.

New Information (cont.)

• It is very important for anyone performing scientific investigations to use safe practices.

• For information on safe practices, consult the Science Safety Skill Handbook in the back of your book.

New Information (cont.)

A. scientific law

B. scientific theory

C. prediction

D. hypothesis

Which is an explanation of observations or events that is based on knowledge gained from many observations and investigations?

A. Earth science

B. life science

C. physical science

D. biology

Which of these includes the study of physics and chemistry?

A. prediction

B. hypothesis

C. inference

D. observation

Which term refers to the act of using one or more of your senses to gather information and taking notes of what occurs?