What are liquids and gases known as D?

Answer 1

Hard to be sure without more context, but "D" generally refers to deuterium, which is an isotope of hydrogen. Deuterium is simply hydrogen with an extra neutron (for a total of one proton and one neutron in the nucleus). Common molecules include D2 and D2O, although any molecule that contains hydrogen can also be found with D instead.

Answer 2

Two separate STATES of matter. For example, N (nitrogen) at ambient temperature is gaseous, and at a much lower temperature it becomes liquid. Ergo, should Fe (iron) in it's solid state, at STP, become liquid at approximately 2400oF also to be considered a fluid? Don't think so. Whether an element is to be considered as a gas, liquid, or solid depends upon time, temperature, and pressure.

Liquids and gases could be considered as fluids because both are capable of "flowing", but they are not the only ones. Liquids and gases are usually known as states of matter. The "big three" are solids, liquids and gases. But we also know of the plasma, which is a superheated material, so make that four. There are a couple of other states of matter, but they are only found under the most extreme conditions. Begin you study of the states of matter with the "big three" and include plasma. Get a handle on them, and particularly on what is involved in their changing states from one to another.

Answer 3

-fluids