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Basic Principles of Science Biology Praxis II

Precision (precise measurements)

repeated measurements show the same result

Accuracy (accurate measurements)

how close a measurement is to the real or accepted value

SI length

meter (m)

SI mass

kilogram (kg)

SI time

second (s)

SI standard temperature

degrees Celsius (degrees C)

SI volume

liter (l)

SI electric current

ampere (A)

SI thermodynamic temperature

Kelvin (K)

SI luminous intensity

candela (cd)

SI amount of substance

mole (mol)

Fahrenheit to Celsius

Fahrenheit - 32 divided by 1.8 = Celsius

Celsius to Fahrenheit

Celsius X 1.8 +32 = Fahrenheit

significant figures

you are allowed 1 uncertain figure past marked units when measuring

Percent Accuracy

% error = /your measured result - accepted value/ divided by the accepted value X 100

scientific notation

number = a X 10(to the b power) (ex. 4,367 = 4.367 X 10 to the 4th power; 0.0000567 = 5.67 X 10 to the -5 power)

dependent variable

the variable that you measure (y-axis); it changes as a result of changing the independent variable (y is dependent on x)

independent variable

the variable that you manipulate in an experiment (x-axis)

Celsius to Kelvin

Celsius +273

tera (T)

1 trillion

giga (G)

1 billion

mega (M)

1 million

kilo (k)

1 thousand

hecto (h)

1 hundred

deka (da)

1 ten

deci (d)

1 tenth

centi (c)

1 hundredth

milli (m)

1 thousandth

micro (µ)

1 millionth

nano (n)

1 billionth

pico (p)

1 trillionth

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