Lithotripsy is a procedure that uses shock waves to break up stones in the kidney, bladder, or ureter (tube that carries urine from your kidneys to your bladder). After the procedure, the tiny pieces of stones pass out of your body in your urine.
Propane gas is ideal for grills because, when pressurized, it compresses and turns to liquid, making it easy to store in tanks. It also contains more cooking energy than natural gas as measured in British Thermal Units (BTU). A BTU is the amount of energy required to raise the temperature of one pound of water 1Â°F. There are about 2,500 BTU in one cubic foot of propane and only about 1,000 BTU in one cubic foot of natural gas. Manufacturers tout the number of BTU their grills can produce, but the number can be very misleading. BTU is not indicative of the heat it can generate.
Natural gas use is measured by volume in units of 100 cubic feet (ccf). For billing, ccf is converted into therms, a measure of heat content. One therm equals 100,000 British thermal units (Btu). One therm of natural gas is also roughly equal to one ccf. Operating Cost Calculation. Most natural gas appliance ratings are expressed as Btu per hour (Btuh). This rating indicates the amount of energy required (input) or energy produced (output) by the unit. Such information can be found on the appliance nameplate or in the ownerâs manual.