system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: how do lotions that you wash off immediately(in the shower or in the sink) work if they’re on your skin for such a short amount of time?
gpt
The lotion is made of two main components: an oily phase and a watery phase. When you apply water, the watery phase will dissolve and wash away while the oily phase will resist the water and remain stuck to your skin, providing the moistness.