Sometimes the taps have a little bit of water come out for a few seconds while I'm just sat around not doing anything with the sink
Plumbing – Why does water randomly come out of the kitchen tap every now and then
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Best Answer
If this happens just one or twice a few minutes after you've used the cold tap, it's more likely to be thermal expansion. Especially in the winter when the water arrives further below room temperature, or if you have a mixer tap. Some taps hold quite a lot of water, and the few percent thermal expansion from the incoming temperature to run temperature can easily account for a little bit of water coming out.
On the hot, this can't happen, as instead the water shrinks as it cools. But the tap can open slightly as it cools. This tends to make it drip repeatedly.