# A substance X melts at -60C and boils at 550C. What would be its physical state at  1. -80C 2. 600C 3. 250C 4. -10C I've heard since physical state depends upon the room temperature that is taken...

A substance X melts at -60C and boils at 550C. What would be its physical state at

1. -80C

2. 600C

3. 250C

4. -10C

I've heard since physical state depends upon the room temperature that is taken to be 25C. How will we determine the above mentioned physical states using room temperature. Thanks.

llltkl | Student

Yes, the physical state of a substance does depend upon the room temperature. Here room temperature means the different temperatures quoted above. The substance melts at -60ᵒC and boils at 550ᵒC. That means in the temperature range -60ᵒC to 550ᵒC the substance is in the liquid state. Below -60ᵒC it will be solid and above 550ᵒC it will be in the gaseous phase. So, at temperatures (4)-10ᵒC, or (3) 250ᵒC, the substance will remain in the liquid form, albeit at varying densities. At the temperature of (1)  -80ᵒC (below its m.p.) it will be in the solid form and at (2) 600ᵒC (above its b.p.) it will remain in the gaseous form.

25ᵒC is taken as the standard room temperature, when no specific mention is made, hence not applicable here as there is specific mention of the different temperatures as the experimental room temperatures.