Matter is anything that has mass and occupies space. Every substance is made of matter and has unique properties.
Physical properties are those properties that can be measured (or) observed without changing the identity or the composition of the substance.
Ex: Colour, length, mass, area, texture, elasticity, odour, melting point and boiling point Physical properties useful in describing about substance.
The chemical properties of a substance can be observed when a substance undergoes a chemical change or chemical reaction.Flammability, reactivity to an acid and reactivition with water are some of the chemical changes observed in a substance.
Ex: Burning of sulphur produces a blue clear flame. Thus, the blue clear flame is a chemical property.
Common quantitative measurements of matter are :
- Density and
Mass is the amount of matter present in a substance, while weight is the gravitational force exerted on a substance.
Thus the mass of a substance remains constant, whereas its weight may differ from one place to another, due to change in the gravitational force.
Mass can be accurately measured with the help of an analytical balance. Volume is defined as ’the space occupied by the object which is enclosed in a container’. unit of Volume that is commonly used is litre.
1litre = 1cubic decimetre = 1000cc
Density is the amount of mass per unit volume of the substance. Temperature is defined as intensity of heat present within the object. There are three scales used to measure temperature.
- Degree Celsius
- Degree Fahrenheit
Celsius scale is the most common unit for temperature. SI unit for temperature is Kelvin.
| Temperature in Kelvin = Temperature in Celsius + 273
|Temperature in Fahrenheit = 9/5 (Temperature in Celsius + 32)