Abeka 9th Grade Science - Chapter 2

technology

science put to use

equation

a set of symbols summarizing a mathematical relationship between quantities

significant figures

the places that are certain, along with one uncertain place; the decimal places in a measurement have physical meaning

scientific notation

a "shortcut" to writing extremely large or small numbers

system of measurement

a collection of compatible, related units that can be used to measure various quantities such as length, mass, weight, or volume

cubit

one of the earliest units of measurement based on the length of a person's arm from the elbow to the tip of the middle finger

standard of measure

a specific measure to which other measures are compared to ensure uniformity

micro-

one millionth

kilo-

one thousand

absolute zero

the coldest possible temperature

dimensional analysis

the technique of converting units

specific gravity

the ratio of the density of a substance compared to the density of water

How many centimeters are in a meter?

100 centimeters

How many grams are in a megagram

1,000,000 grams

Why can density be used to identify substances?

each substance has a characteristic density

what is the language of science

mathematics

system of measurement commonly used in the U.S. today

F.P.S. system

system of measurement developed in France in the 1700's

metric system

System of measurement that has been universally accepted as the standard for scientific and technical purposes

SI (System International)

Temperature scale used in most nations

Celsius scale

Precision

a measure of how close a series of measurements are to one another

Accuracy

how close a measurement is to the true value

3 ways to measure volume

Geometric formula, water displacement, Direct measurment

A direct proportion is

a relationship between two variables in which their ratio is constant

What greek letter represents density

Rho (ρ)

To Convert Celsius to Kelvin use the formula

K = C + 273.15

To Convert Kelvin to Celsius use the formula

C = K - 273.15

To Convert Fahrenheit to Celsius use the formula

C = 5/9(F - 32)

To Convert Celsius to Fahrenheit use the formula

F = 9/5C + 32

The Formula to find density is

p = m/V