Answer:
You may enter, but you may not come in. I have space, but no room, I have keys, but open no lock. What am I?
I am bought by the yard but worn by the foot. What am I?
I am the book one can never finish reading
you need thousands of me to create a digital image.
Part carbon part water I am poison to the fishes. Many falsely claim my name I am the pause that refreshes.
What is lighter than what it is made of?