We use gases every day in our lives. The gases that we use are air, natural gas, oxygen, carbon dioxide, nitrogen, and water vapor.
Diffusion.
Gases are useful for lots of things. you might need to specify on what gas it is?
Gases are compressible.
so that you are able to breath
Greenhouse gases have many positive effects. Some of these are limiting the need for fossil fuels, making previously uninhabitable and unusable farmland useful, and increasing the yeild of certain crops.
because they really wanted too
Methane can be used to create energy
Refrigerators, combustion engines, air cannons, SCUBA and submarines.
Some examples of useful mixtures include air (a mixture of gases), soil (a mixture of organic matter and minerals), and alloys (mixtures of metals). These mixtures have unique properties that make them valuable in various applications ranging from construction to manufacturing.
Gases are compressible.
some solids,liquids and gases are dangers some are not dangers
Some yes,some,no. There are uesful and not-so-useful in both sexes. It really depends on your definition of "useful".