Answer:
Mass by mass
Explanation:
Because it's telling only about mass in grams
Answer:
The critical temperature of a substance is the temperature at and above which vapour of the substance cannot be liquefied, no matter how much pressure is applied.
http://www.atnf.csiro.au/outreach/education/senior/cosmicengine/stars_hrdiagram.html. This will give u the answer, just go to link
Fine particles, ground level ozone, sulfur dioxide, nitrogen dioxide, lead