States & mixtures
Melting point — গলনাঙ্ক
Quick answer
The temperature where a solid becomes a liquid; while melting, temperature holds steady because heat goes into breaking the crystal.
Definition
The melting point is the temperature at which a solid turns into a liquid at atmospheric pressure. At this temperature the solid and liquid exist together in equilibrium; added heat goes into breaking the crystal arrangement, not into raising temperature. That is why a bowl of melting ice stays at 0 °C until every crystal is gone. Impurities lower the melting point, which is one way chemists check purity.
For example
Mercury melts at −39 °C, so it stays liquid even in a cold Dhaka winter; iron needs 1538 °C, which is why a blacksmith's furnace glows so bright.