1)&nbsp;Have You Heard About Compressed Gases? Are They of Any Use to Us? If Yes, Give Examples for the Same.
Yes, compressed gases are used by us for various purposes.
<ul>
<li>LPG (Liquefied Petroleum Gas) used for cooking food is actually a mixture of gases that has been compressed into a liquid form.</li>
<li>CNG (Compressed Natural Gas) is used as fuel in vehicles.</li>
</ul>
&nbsp;
2) Why Do We Not See Any Liquid Gas Coming Out of Stoves As Soon as We Open the Knob?
<ul>
<li>A gas is compressed using high pressure.</li>
<li>The cylinders in which the gas is filled maintain the same pressure.</li>
<li>As soon as the liquefied gas escapes the cylinder and reaches the stove, it changes into a gas due to a decrease in the pressure.</li>
</ul>

Understand how matter changes states—solid, liquid, and gas—and the conditions that cause these transformations in everyday life.

Changing of States of Matter