How is a gas able to fill a container of any size or shape

The constant motion of particles in a gas allows a gas to fill a container of any shape or size. Particles in a gas are in constant, random motion. The motion of one particle is unaffected by the motion of other particles unless the particles collide.

i don't know what the picture looks like but i can take a guess and say maybe basidiomycetes?

characterization of nanoparticles is a critical step in nanomaterial production as it provides information of dimension, morphology, surface charge, distribution and degree of surface functionalization.