Chapter 0

Metric system: a standard measurment system based on the number10.

SI: version of the metric system called International System of Units, scientis use.

Scientios use SI to compare data and communicate resultS.

SI prefixes show how measurments increase and decrease by powers of 10.

Basic unit for length : meter (m)

Mass ; the amount of matter in an object

Basic unit for mass:gram (g).

- Weight: the measure of the force of gravity acting on an object

Basic unit for weight:Newton (N

- Volume: the amount of Space taken up by an obect or substance=

Basic unit for volome (solids) : cubic meter (Cm3)

Bosic unit for volume (liquids): liter (L)

How to find the volume of rectangular solids:

length x width y height

Hoc to find the volume of aliquid?

With a graduated cylinder or beaker, messe read the Meniscus(curve op liquid)

How to find the volume of in irregular solid?

Use the displacment of water.

Density: the measure Of how much mess is contened in a given

Volume,

Bosic unit for Density :(Kg /m3)

How to calculate Density?, mass/ volume

BasIc unit for Time: Seconds (s)

SI unit for temperature: Kelvin (K)

Metric unit for temperature: Celcius (C)

MATA SKILLS IN Science

Estimation: An approximation of a number based on reasonable

assumptions (usefull when you camt count every inclibidual item or measure it directiy.)

Accuracy• How close a measurment is to the true or accepted valite.

Precision: how close a group of measurments are to each othere

MATH TOOLS

Mean- the average of a set of data

Median- the middle number in an orderd set of data

Mode- the number that appears most aflen in a list of numbers

Range- the difference between the greatest and lower value in the data set.

Percent error - the difference between the known valve Of a substance and its measured Value.

(experimenter value- true value /true value)x100%