Is cloud in solid or liquid state ?

Answer 1

It depends on the cloud. A cirrus cloud very high in the atmosphere may consist of tiny ice crystals while a stratus cloud in the lower atmosphere may be water droplets.

In short, it can be both.

Answer 2

That depends on the definitions of solid and liquid. Check these out:

"sol·id (sld) KEY

ADJECTIVE:
sol·id·er , sol·id·est

Of definite shape and volume; not liquid or gaseous.
Firm or compact in substance." [See source.]

Clearly clouds are not of a definite shape and volume; and they are anything but compact or firm. Thus, clouds are not solid even though the particulates they are made of may be solid like ice crystals. So what about liquid then?

"liq·uid (lkwd) KEY

NOUN:
The state of matter in which a substance exhibits a characteristic readiness to flow, little or no tendency to disperse, and relatively high incompressibility." [See source.]

Although there might be a readiness to flow, there is also frequently a tendency to disperse and clouds are very very compressible. Clearly they are not in liquid state even though their particulates, water droplets, might be.

So the answer to your question is no.

In fact, no matter what the particulates are in a cloud, a cloud behaves like an imperfect gas. Check this:

"gas (gs) KEY

NOUN:
pl. gas·es or gas·ses

The state of matter distinguished from the solid and liquid states by relatively low density and viscosity, relatively great expansion and contraction with changes in pressure and temperature, the ability to diffuse readily, and the spontaneous tendency to become distributed uniformly throughout any container." [See source.]

It's clear that clouds are relatively low density; after all, they float in air, which means they are lower density than air. And they are certainly not viscose; if they were, birds and airplanes could not fly through them very well. Finally, they readily disperse; especially when there are changes in the temperature and air pressures.

Many of the answers were misguided by addressing the particulates that make up clouds. But that was not your question, you asked about the clouds themselves. They are gases, which may be made up of liquid or solid particulates.

Answer 3

That depends on the cloud.

A cloud is comprised of tiny water droplets (liquid) or ice crystals (solid) or a combination of the two (both).

Answer 4

Can't be solid otherwise birds would crash into them :)

Clouds are made of tiny water droplets.

Answer 5

Can be either depending on temperature.

Answer 6

gas.