Properties of matter-

## Properties of matter-

Each substance has unique properties, these are physical & chemical properties.

Physical properties can be measured without changing the composition of the compound, these are color, odor, melting point, boiling point, density, etc.

Chemical properties can be measured by a chemical change.

The SI system has seven base units.

The seven base quantities and their corresponding units are:

1 – Length  ‘l’ meter (m)

2- Mass ‘m’ kilogram (kg)

3- Time ‘t’ second (s)

4- Electric current  ‘I’ ampere (A)

5 – Thermodynamic temperature ‘T’ kelvin  (K)

6 – Amount of substance ‘n’ mole (mol)

7 – Luminous intensity ‘Iv’ candela ( cd)

## Derived units –

### Mass & Weight-

Mass of a substance is the amount of matter present in it, the mass of a substance is constant & determined accurately by analytical balance.

Weight is the force exerted by gravity on an object.  Due to changes in gravity, weight may vary from one place to another.

### Volume-

Volume is the amount of space occupied by a substance. Its unit is m3 or cm3 or dm3, but the SI unit is m3.

### Density-

The density of a substance is its amount of mass per unit volume.

density = mass / volume

Its unit is gm/ml but the SI unit of density is  Kg/m3

### Temperature-

Three common scales to measure temperature is, degree centigrade(°C), degree Fahrenheit (°F) & Kelvin (K)

### Celsius to Fahrenheit Conversion Formula

°F = (°C × 9/5) + 32

°C = (°F − 32) x 5/9

C = K – 273.15

K = C + 273.15

### Length-

#### SI unit: Meter (m)

1 kilometer     = 1000 meter = 0.62137 mile
1 meter            = 100 centimeter
1 centimeter   = 10 millimeter
1 nanometer   = 1.00 x 10-9 meter
1 picometer    = 1.00 x 10-12 meter
1 inch               = 2.54 centimeter
1 Ångstrom   = 1.00 x 10-10 meter

### Volume-

#### SI unit: Cubic meter (m3)

1 liter (L) = 1 x 10-3m3 = 1000 ml or cm3 = 1.0567 quarts
1 gallon = 4.00 quarts

1 gallon  = 3.78541 litre

### Mass-

SI unit: Kilogram (kg)

1 kilogram = 1000 grams
1 gram        = 1000 milligrams
1 pound     = 453.59237 gram = 16 ounces
1 ton           = 2000 pounds