Arrange in two layers, called the phospholipid bilayer. Phospholipid molecule has a head, and two tails. The head is hydrophilic (it likes water) and the tails are hydrophobic (phobic meaning it has a phobia of water, or in simple words, hates water).
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For example, think about a situation in which your college is doing an experiment using some toxic chemicals. Let's say that they stumble and fall, the container breaks and some of the chemicals are sprayed on you! you need a protective equipment then.