* Room temperature isn't a single, defined value. It varies depending on the location and season. We generally think of it as somewhere between 20-25°C (68-77°F).
* Different substances have different melting and boiling points. Water is liquid at room temperature, but iron is solid and oxygen is a gas.
To answer your question more accurately, you need to specify what substance you're asking about.
For example:
* What is the state of matter of water at room temperature? Answer: Liquid.
* What is the state of matter of mercury at room temperature? Answer: Liquid.
* What is the state of matter of helium at room temperature? Answer: Gas.
Let me know if you have a specific substance in mind, and I can tell you its state at room temperature!
