Answer:
What can be measured but not seen?
It's like food but water kills it. What is it?
Reaching stiffly for the sky, I bare my fingers when its cold. In warmth I wear an emerald glove and in between I dress in gold.
As round as an apple. As deep as a cup. All the king's horses can't pull it up.
Sometimes I am loud. And viewed with distaste. Poke out my 'eye', then I'm on the front of your face.
In your fire you hear me scream! Creaking and whining yet I am dead before you lay me in your hearth.