States & mixtures
States of matter — পদার্থের অবস্থা
Quick answer
The forms matter takes — solid, liquid, gas (plus plasma); ice, water and steam are one substance in three states.
Definition
The states of matter are the common forms a substance takes: solid, liquid and gas, with plasma as a fourth high-energy state. In a solid, particles vibrate in fixed places; in a liquid they slide past each other but stay close; in a gas they fly freely far apart. Heat, pressure and particle type decide which state a substance is in. Water is the friendly example: ice, liquid water and steam are the same in three states.
For example
A candle shows two changes of state at once: solid wax melts to liquid, and some of that liquid climbs the wick, leaves as vapour and burns.