What is the shape of a propane molecule?
The carbon atoms in alkanes are sp3-hybridized, and have tetrahedral shapes, with the bonded atoms at angles of 109.5° to each other. Free rotation is possible around the carbon-carbon single bonds in alkanes, making the carbon chains very flexible and "floppy" — particularly for the larger molecules.
- Propane is produced as a by-product of two other processes, natural gas processing and petroleum refining. The processing of natural gas involves removal of butane, propane, and large amounts of ethane from the raw gas, in order to prevent condensation of these volatiles in natural gas pipelines.
- An empty 20 lb tank will hold about 4.7 gallons of propane. That is $18.47 at $3.93 per gallon, which is the low quantity price (I just paid $3.44 per gallon when filling several tanks). The exchange is about the same price.
- Propane (also called liquefied petroleum gas (LPG), or LP gas) is typically transported and stored as a very cold liquid, and can cause a “freeze burn” or frostbite if it contacts the skin. Propane vapors are heavier than air, while natural gas is lighter than air.
It means that the propane is suitable and recommended for engine fuel use, which was the original purpose of the HD5 grade propane specification. HD5 spec propane consists of: Minimum of 90% propane. Maximum of 5% propylene - propylene is used in the manufacture of plastics.
- Many appliances can work with either propane or natural gas (water heaters are perhaps the biggest exception). They will, however, require special gas utilization fittings for each fuel source, because propane and natural gas operate with different levels of pressure.
- Since many grills don't have reliable fuel gauges, knowing how long a propane tank will last is critical. Most gas grills use standard 20-pound propane tanks. On a mid-size barbecue, one tank can usually be counted on to provide between 18-20 hours of grilling time.
- Propane vs. natural gas cost comparison. If the natural gas cost is $15.00 per 1,000 cubic feet, the same $15.00 will purchase around one million BTUs, this is the equivalent of slightly over 11.20 gallons of propane. If propane costs $2.50 per gallon, in this example, natural gas is the cheaper alternative.
Updated: 10th October 2018