Metallic solid is the meaning of a certain alloy that was probably originally liquid but was then manufactured to become a solid metallic alloy. But in non nerd details; a metal liquid turned into a solid metal.
Other than rockets that use solid propellants or liquids (hydrazine, kerosene), large multi-stage rockets can be fueled with liquid hydrogen and liquid oxygen. The frigid liquid form is used because it provides a greater volume of propellant than simply pressurized gas. The more fuel it has, the faster and higher a rocket can go.
Pebbles are solid.
silicon is a solid silicon is a solid
At standard temperature and pressure (20oC and 1 atmosphere) it is a solid.
Solid propellants generally require indoor storage to prevent moisture damage. Once they become wet, the propellant is unable to be ignited and becomes useless.
F. A. Williams has written: 'Fundamental aspects of solid propellant rockets' -- subject(s): Solid propellant rockets, Solid propellants
James I. Craig has written: 'Audible and ultrasonic emissions from composite solid propellants'
LIQUID PROPELLENTS OR SOLID PROPELLANTS
As asked this question has no answer, as there are no propellants in nuclear reactors.
The first propellants were used for engines. Propellants help the aircraft move forward. Moving forward at high speeds causes lift around wings.
A hybrid rocket is the rocket with a rocket motor that uses propellants in two different states of matter; one liquid or gas and one solid.
Konstantin Eduardovitch Tsiolkovsky, Robert Hutchings Goddard, and Hermann Oberth are the three men known for their work with rockets. They designed the first liquid and solid propellants.
Solid fueled missiles are just that. They are propelled by a solid fuel. For an everyday example of that, pick up an Estes rocket kit from Michael's craft store and look at it's propellant. Liquid propelled missiles us a liquid propellant, like your car. Liquid propellants also require a second oxidiser, either air or stored oxidiser to burn, solid propellants generally have the oxidizer mixed in. Solid fueled rockets typically can be handled rougher as they are more stable than their liquid counterparts. Hope that answers your question.
Those can that make many scent can. how they make it. How they put propellants in the spray?
It depends on your goals. You an purchase air powered Nerf rockets. You can also buy toy rocket kits with solid propellants... at least you used to be able to buy them.
Most commonly this might be aluminum. Others such as beryllium may be used. For more details please see the wikipedia articles about rocket propellants and solid fuel rockets.