Physical Science Ch 2, sec 1 tools in science
8
Section 1 Tools and Models in Science Chapter 2 Tools in Science •A tool is anything that helps you do a task. • Scientists use many different tools to help them make observations, take measurements, and analyze data.
description
Transcript of Physical Science Ch 2, sec 1 tools in science
Section 1 Tools and Models in ScienceChapter 2
Tools in Science
• A tool is anything that helps you do a task.
• Scientists use many different tools to help them make observations, take measurements, and analyze data.
Section 1 Tools and Models in ScienceChapter 2
Making Measurements
• The International System of Units (SI) is the standard system of measurement. All SI units are expressed in multiples of 10.
• Prefixes are used to express SI units that are larger or smaller than basic units. For example, kilo- means 1,000 times, and milli- indicates 1/1,000 times.
Section 1 Tools and Models in ScienceChapter 2
Making Measurements, continued
• Length, mass, volume, density, and temperature are common measurements.
• The meter is the basic SI unit of length.
• The kilogram (kg) is the basic SI unit for mass. Mass is the measure of the amount of matter in an object.
Section 1 Tools and Models in ScienceChapter 2
Making Measurements, continued
• Liquid volume is expressed in liters (L). Volume is a measure of the size of an object in three-dimensional space.
• The volume of solid objects is usually expressed in cubic meters (m3).
Section 1 Tools and Models in ScienceChapter 2
Making Measurements, continued
• Density is the ratio of the mass of a substance to the volume of the substance.
• The temperature of a substance is a measurement of how hot the substance is.
• The kelvin (K) is the SI unit for temperature.
Data in ScienceChapter 2
Section 1 Tools and Models in ScienceChapter 2
Models in Science
• A model is a representation of an object or system. A model uses something familiar to help you understand something that is not familiar.
• Physical, conceptual, and mathematical models are commonly used in science.
• Models have limitations because they are never exactly like the real thing.
Section 1 Tools and Models in ScienceChapter 2
Using Models for Scientific Progress
• In science, a theory is a system of ideas that explains many related observations and is supported by a large body of evidence acquired through scientific investigation.
• In science, a law is a descriptive statement or equation that reliably predicts events under certain conditions.
