1. Natural gas is actually odorless, colorless, and tasteless in its natural state. To detect a natural gas leak, a distinctive odorant called mercaptan is added to give it a smell similar to rotten eggs. This strong odor helps people easily detect gas leaks even if they can't see the gas itself.
2. Water is a substance that commonly exists in all three states of matter: solid (ice), liquid (water), and gas (water vapor). This is due to the unique properties of water that allow it to change its state under different temperature and pressure conditions.
3. When water is cooled below 0 degrees Celsius, it freezes and becomes solid ice. When heated above 0 degrees Celsius, ice melts into liquid water. Further heating of water causes it to evaporate and turn into water vapor, which is a gas. The ability of water to exist in all three states makes it a versatile substance in nature.
