Why is the clear area surrounding an antibiotic disk called the zone of inhibition?

No bacteria grows in surrounding area of antibiotic disk, thus it is known as zone of inhibition

Explanation:

The area surrounding an antibiotic disk is called the zone of inhibition because in this region bacteria & its colonies are unable to grow. Due to the anti microbial effect produced by bacteria, there is no visible sign of presence of bacteria in the inhibition region.

Also,  the zone of inhibition also depicts susceptibility of bacteria towards the effect of antibiotics.

the potatoes have high sugar concentrations and although these potatoes were different we could seethe effects that their sugar concentrations had in different environments. for example, the potatoes in sample a, were placed in pure water. this created a hypertonic environment and caused the potatoes to draw in water from its surroundings. we saw the opposite happen with the potatoes in sample b when placed in the sodium chloride solution. the potatoes in this case were in a hypotonic solution and therefore lost water to their surroundings.