The troposphere contains 75 percent of atmosphere's mass-on an average day the weight of the molecules in the air is14.7 lb..(sq. in.)- and most of the atmosphere's water vapor.ater vapor plays a major role in regulating air temperature because it absorbs solar energy and thermal radiation from the planet's surface. The troposphere contains 99% of the water vapor in the atmosphere. Water vapor concentrations vary with latitudinal position(north to south).
Proper is different from typical or average. Average mantel height is about 54 above the hearth extension. Proper depends on the fireplace size, required clearances and the aesthetic desired, which can vary widely. These are both proper mantel heights: This one's about 48 high.
Stone Fireplace Price Range $4500-$6000 Installed. These fireplaces usually have ceilings that are 18â high or more and the returns can vary in depth. The work will take anywhere from 2-4 days and clients usually add extras such as a mantel, TV, new doors and sometimes a limestone hearth.