Question

What is the physical state of water at:
(a) 25$^\circ$C
(b) 0$^\circ$C
(c) 100$^\circ$C

Answer 1

Hint: We know that there are three states of matter, i.e. solid, liquid, or gas. It is known to us that water exists in three states at different temperatures. So, just consider the freezing point, and the boiling point of water. We can identify the state of water at the given temperatures.

Complete step by step solution:
Now, we have to determine the physical state of water at the different temperatures mentioned in the question.
First, as we know solid state of water is known as ice, liquid state is water, and the gaseous state is vapour form.
We know that conversion of state occurs at a different temperature like freezing point of water is 0$^\circ$C; it means that water will start freezing at this temperature.
Now, the first (a) we have is 25$^\circ$C; it exists in the liquid state, as it is above the freezing point of water, and below the boiling point of water.
Now, the second (b) we have is 0$^\circ$C; as we already discussed the given temperature is the freezing point of water.
So, we can say that at 0$^\circ$C, water will exist in the solid state.
Talking about the third (c) we have is 100$^\circ$C; we know that the given temperature is the boiling point of water.
We can say that the water starts boiling at this temperature, so the physical state will be gaseous.

So, we can represent it as:
Solid $\xrightarrow{25^\circ C}$ Liquid $\xrightarrow{100^\circ C}$ Gas
In the last we can conclude that the physical state of water at (a) is liquid, (b) is solid, (c) is gaseous state respectively.

Note: Don’t be confused while determining the physical state of water. As mentioned just remember the boiling point, and freezing point of water. On the basis of that we have determined the states.