Balloon.
helium,oxygen
Solid objects may melt into a liquid form when they are heated. Liquids may become gases when heated. When objects are combined and heated, they can become new objects altogether, like in cooking.
Diamonds, steel, and rocks are hard objects.
There is no generic name for such objects but I can give you some specific examples:- Pumice Styrofoam Gases The planet Saturn (which if you could do it would float on water).
give names of gases
Methane, ethane and propane are some of them. Other gases of this kind would include hydrogen or helium
Planets, the sun, asteroids, comets, satellites from the different planets, gases, rocks, etc.
A mixture of two gases, which some would call a solution of one of the gases in the other.
The Sun, moons , planets, asteroids, comets, meteoroids, dust, gases are all in our solar system. There are also man made objects floating around such as satellites and space probes.
carbon monoxide,nitrogen gas,carbondioxide are some of the gases that coming from the sun are causes for thinning of the ozone
Radon,Argon,Helium just to name a few
I believe you are looking for semi-permiable membrane.