Passion and enthusiasm - what does it mean?

Hi all

in response to many questions one has read that in your Personal Statement (and in the interview if you are called for one), OxBridge would look for evidence of passion and enthusiasm for your subject. I am studying physics chemistry maths and further maths in AS and will carry all 4 forward to A2. I am thinking of either natural sciences or chemistry, based on how my AS goes off. I would like your views of what OxBridge would see as possible examples of passion / enthusiasm for the subject. In the summer I will be doing a 2 week stint in the R&D centre of one of the world's most famous consumer goods companies. I also read the books recommended by my professors on the subjects. What else to demonstrate passion and enthusiasm? Your views and thoughts would greatly help. Thank you