Answer:
I help engines spin and pants stay up. What am I?
I have keys but no locks. I have space but no room. You can enter but canβt go outside. What am I?
The shorter I am, the bigger I am. What am I?
The more you have of it the less you see. What is it?
I fly away as soon as you set me loose. People around you may slowly move away once they sense my presence.
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?