Exploring Life Science Chapter 1  The Nature of Science The Nature of Science  Scientific Method Scientific Method  Metric System Metric System  Scientific Tools Scientific Tools

Science is not just for Scientists:  The goal of science is to understand the world around us. We make observations, gather facts, and perform experiments.  Develop a theory; the most logical explanation for events that occur in nature.  If a hypothesis survives many test it can become a law. A law summarizes observed experimental facts.

Branches of Life Science:

The Scientific Method  The systematic approach to problem solving. 1.Stating the Problem: What do you want to know? 2.Gathering Information on the Problem: research! 3.Forming a Hypothesis: an educated guess. 4.Performing Experiments: test the hypothesis. 5.Recording and Analyzing Data. 6.Stating a Conclusion.

The Metric System:  The standard system used by all scientists.  It is a decimal system: based on multiples of 10.  Length: Meter Length: Meter  Volume: Liter Volume: Liter  Mass: Kilogram Mass: Kilogram  Weight: Newton  Temperature: Celsius Temperature: Celsius

Length: 1 Meter (m) = 39.4 inches 1 Meter = 100 Centimeters (cm) 1 Meter = 1000 Millimeters (mm) 1 Kilometer (km) = 1000 meters 1 Meter = 1,000,000 Micrometers (um) 1 Meter = 1,000,000,000 Nanometers (nm) 1 Meter = 10,000,000,000 Angstroms (A) ALL MULTIPLES OF 10!

Volume:  1 Liter (L) = 1000 milliliters (ml)  1 Liter = 1000 cubic centimeters (cm3)

Mass 1 Kilogram (kg)= 1000 grams (g) 1 gram (g) = 1000 milligrams (mg) 1000 kilograms = 1 metric ton (t)

Temperature:  0 degrees C = Freezing point of water  100 degrees C = Boiling point of water

Tools of a Life Scientist:  Microscopes Microscopes  Looking Inside! Looking Inside!  Lasers Lasers  Computers Computers

Microscopes:

Looking inside:  X-Ray : Invisible radiation, takes pictures of bones.  CT Scan (Computed Tomography): Takes cross- sectional pictures of objects.  MRI ( Magnetic Resonance Imaging): Uses Magnetism and radio waves to produce images.

Lasers  A laser is a tool that produces a narrow, intense beam of light.  Used as a scalpel in surgery.

Computers:  Computers are used by scientists for:  Researching and collecting data.  Display data.  Store data.  Doctors use them to diagnose diseases.

The End  By Mrs. Scibelli  Exploring Life Science