Because it does not inhibit bacteria form "swimming" through the medium.
Semisolid media contains a 1.5% concentration of agar, which is used to grow and select isolated colonies. Semisolid media contains agar at a lower concentration (around 0.4%,) which is used for motility studies.
By a simple observation; also a semisolid substance can flow without any stress.
Semisolid drugs are often used for topical application. These drugs are soft and pliable. Semisolid drugs include creams, ointments, most plasters, and dry-powder aerosols. I am not sure about gels?
Agar is a common semisolid medium used to grow bacteria. It is made from seaweed and provides a solid surface for bacteria to grow on while allowing for easy diffusion of nutrients. Agar can be poured into Petri dishes or test tubes for bacterial culture.
The semisolid part of the Earth is the mantle, which lies between the Earth's crust and its core. The mantle is composed of solid rock that can flow slowly over long periods of time, giving it a semisolid characteristic.
Petroleum jelly is a semisolid mixture of hydrocarbons obtained from petroleum. I do not know what Peteroluem jelly is, maybe a semisolid mixture of Peters??
semisolid
feces
The semisolid mixture of food, acid, and enzymes in the stomach is called chyme.
Its not that simple. Different applications call for different types of lubricant. Using a semisolid in some applications would be catastrophic while in others it is perfect.
Semisolid preparation for external application
The chemical composition is different.