They are mostly solid.
A plasma.
The most common type of energy/mass in the Universe is in the form of dark energy, followed by dark matter. Only about 4% of the Universe is in the form of "normal" (baryonic) matter. If it is specifically to this matter you refer: the most common state of matter is plasma, found in stars.
compunds
compound
Matter is important because it makes up everything around you; matter can not be created or destroyed it just transformed into a different form.
float around in the air.
The name for the solid particles around that the clouds can form is called atmospheric particulate matter. Another name for atmospheric particulate matter is particulates.
Dark energy is believed to make up about 73% of the mass of the Universe; dar matter about 23%; and normal matter - the kind we know most about - about 4%. In the case of normal matter, most of it is still in the form of hydrogen.
Water is the most dense in its liquid form.
Compounds
Around 99.5%
you can learn that vampiers do exist they can be human form or an animal form. no matter wat vampires are lurking around.