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If Petri dishes were incubated right-side-up, there would be more of a chance of them getting contaminated by airborne particles. Having them upside-down also prevents water condensation from accumulating and ruining a culture.
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∙ 9y ago
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∙ 13y agoIf they are incubated right side up, moisture condenses on the lid and drips down on the surface of the agar which causes individual bacterial colonies to spread and mix with each other. And also, to minimize evaporation of water.
Wiki User
∙ 9y agoIn the inverted position, dust and condensation are not able to get into the sample. For this reason, the petri dish is turned upside down.
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∙ 13y agoto minimize the evaporation of water & contamination from extraneous bacteria
Wiki User
∙ 14y agoso that condensation inside the dish doesn't drip down & contaminate the specimen
Wiki User
∙ 14y agoto retain moisture
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