# Measurements and Accuracy

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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

meter (m)

kilogram (kg)

second (s)

### SI standard temperature

degrees Celsius (degrees C)

liter (l)

ampere (A)

Kelvin (K)

candela (cd)

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 +273

1 trillion

1 billion

1 million

1 thousand

1 hundred

1 ten

1 tenth

1 hundredth

1 thousandth

1 millionth

1 billionth

1 trillionth

Example: