# Chapter 3a - Scientific Measurements

### 32 terms by raebaxter

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### measurement

is a comparison of a dimension of an object or substance to an appropriate standard, usually an instrument with a calibrated scale.

### standard

is a known quantity that everyone agrees will be used for comparison when measuring

### instrument

any artificial device made for the purpose of refining, extending or substituting for the humans senses when measuring

### dimension

a property that can be measured

### calibrated scale

the spacing of the marks on the instrument

### unit

the segment of a dimension assigned a value of 1 for measuring

### metric system

measures meter (m) and the kilogram (kg)

### measured data

has two parts:
1) a number that gives the size of the measurement
2) dimensional unit

### observational bias

is a flawed perspective on data that results from a person's desire to see a certain outcome

described data

numerical data

### accuracy

is an assessment of the measurement error

### calibrated

..., -marked with measurements

### mass

amount of matter in a given volume

### objective observation

a more precised(exact) observation, more accurate-(it is not possible to be exact, but close)

### subjective observation

not as precised as the projective observation

### SI

Le Système International d'Unités, or the International System of Units, which is the measurement system that is accepted worldwide...METRIC SYSTEM

### conversion factor

any factor (mulltiplier) used to convert from one unit of measure to another.

### error

difference between a measuremnt and the actual value

### accuracy

is an assessment of the measurement

### precision

exactness, accuracy of a measurement

### significant digit (SD)

a digit in the measurement used to communicate the precision of the measurement.

### scientific notation

a convenient way to express very large or small numbers in the form of M x 10, an expression of numbers in the form m × 10n where m is equal to or greater than 1 and less than 10, and n is an integer, a way of writing very large or very small numbers using a number between 1 and 10 multiplied by a power of ten

### weight (w)

force of gravity pull on the matter in an object

### spring scale

an instrument that measures weight by balancing the pull of the earth's gravity on the object being weighed

### electronic balance

an electronic instrument that measures the weight of an object and then displays is equivalent mass

### balance

an instrument that compares a known mass to an unknown mass. when balanced the weight of the object with unknown mass equals the weight of the known mass.

### volume

the space enclosed or occupied by an object

### meniscus

The curved surface of a liquid

### density(ρ)

the amount of mass of the substance contained in a specific volume

### electronic scale

object to be weighed is placed on a metal plate on top of the instrument. the scale converts the pull of gravity on the object into an electronic signal - weight is displayed on a digital screen.

### Law of mass conservation

mass is neither created or destroyed-physical or chemical change of matter is the same before after

### Flickr Creative Commons Images

Some images used in this set are licensed under the Creative Commons through Flickr.com. Click to see the original works with their full license.

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