I am doing a science fair project and i prepared my perti dishes, but there are water droplets ontop of the dish. should i just leave them there or will then contaminate my sample?
2007-11-17 10:39:02 · 2 answers · asked by Anonymous in Science & Mathematics ➔ Biology
Bad guppy is right. The water comes from what is in the petri dish. Presumably you have liquid or a semisolid in the dish and you keep the dish in an incubator at a higher than room temperature. This high temp causes the water to evaporate and condense on the lid of the dish since the dish is covered. Evaporated and then condensed water is sterile since viruses and bacteria cannot evaporate, and hence cannot recondense. Leave the water where it is, it needs to drip back into your plate since that's where it came from. If you get rid of it, your sample (the contents of you plate), will dehydrate. Good luck.
2007-11-17 16:01:20 · answer #1 · answered by chris g 2 · 0⤊ 0⤋
just leave them. if you haven't touched the area, the water is sterile. it is condensation of water that is released from the media, which is moist.
2007-11-17 21:25:32 · answer #2 · answered by bad guppy 5 · 0⤊ 0⤋