A) There is little attraction between particles of gas . Thus , gas particles move freely in all directions . therefore , gas completely fills the vessel in which it is kept b) Particles of gas move randomly in all directions at high speed .As a result .the particles hit each other and also hit the walls of the container with a force . therefore ,gas exerts pressure on the walls of the container .
c) A wooden table has a definite shape and volume . It is very rigid and cannot be compressed i.e . it has the characteristics of a solid .hence a wooden table should be called a solid .
d) Particles of air have large space between them on the other hand , wood has little space between its particles .Also ,it is rigid . for this reason . we can easily move our hands in air , but to do the same through a solid block of wood ,we need karate expert .