In it, an apparently normal-looking petri dish is treated so as to reveal a message when wetted with water vapor. The contrast between hydrophobic and hydrophilic surfaces, which is not visible to ...

A 100mm petri dish containing water is placed on an overhead projector. When solid Pb(NO 3) 2 is place on one side and solid KI on the other, PbI2 precipitates in the center.

Place petri dish on stage of overhead projector. Pour water into dish to a depth of ¼” to 3/8” Scoop a small amount of Pb(NO3)2 into the water at one side of the dish. Scoop a small amount of KI into ...

Petri dish A glass or plastic circular dish ... Probes are pushed into the soil to obtain a reading. Water bath A container that keeps water heated at a fixed temperature. Used for incubating ...

The sweet dessert is a carrot pudding made with generous amounts of milk, sugar, cardamom and water. From Diwali ... she prepared the dessert in mini petri dishes as a palate cleanser.