The phrase "a visible gap" is correct and usable in written English.
It can be used to describe a gap that can be seen or perceived, often in contexts related to physical spaces, differences, or discrepancies.
Example: "There was a visible gap between the two buildings, highlighting the need for renovation."
Alternatives: "an apparent gap" or "a noticeable gap".
In one study (Spelke et al. 1995), 4.5-month-olds were shown a stage with 2 screens on it, with a visible gap between the screens.
In one version, the visible ends were connected; in the other these ends were separated by a visible gap matching the occluder they'd seen the day before.
Non-union was defined as an unsuccessful healing of the bone after 6 months, clinically manifesting as pain at the fracture site and radiologically as a visible gap between the fracture parts.
This deflection often, but not always, creates a visible gap between the proximal tibiotarsus and fibula in lateral aspect.
Participants were asked to score their answer to "While the finger was elevated off the rubber hand, was it as if the finger you could see in the goggles was causing the touch you could feel, even though there was a visible gap between the finger and the rubber arm?" Data from this one question was included in the final analysis.
# The bulbi were classified as sunken in cases of a visible gap between the eyeball and caruncula lacrimalis.
The explosion, in which at least 42 people died, 38 of them children ranging from 9 to 11 years old, left an unusually visible gap between the government's version of the event and the statements of people in the small village where the blast occurred.
There is an increasingly visible gap between access to maternal health services in Darfur and other regions of the Sudan.
It is extremely difficult to ensure that birds are completely excluded from an entire tree even when careful attention is paid to closing all visible gaps in the net.
Large (>200 nm) monodisperse nanospheres of transparent silica self-assemble into a photonic crystal with a visible band gap, which is retained upon infiltration of small (<20 nm) nanoparticles of magnetic iron oxide.
This has been demonstrated to facilitate water sorption and hydrolytic degradation [26], even in the absence of a visible marginal gap at the tooth biomaterial interface [27].
