All propane cylinders will have a TW stamped in the valve protection ring. The tare weight or TW is the weight of the cylinder empty. TW 18 would be a 18 pound empty cylinder. â¦ If you weigh a TW 18 cylinder on a bathroom scale, and it weighs 28 pounds there would be 10 pounds of propane remaining in the cylinder.ll propane cylinders will have a TW stamped in the valve protection ring. The tare weight or TW is the weight of the cylinder empty. TW 18 would be a 18 pound empty cylinder. â¦ If you weigh a TW 18 cylinder on a bathroom scale, and it weighs 28 pounds there would be 10 pounds of propane remaining in the cylinder.
Although it is passed down from parents to children, about 1/3 of cases are caused by a spontaneous mutation, a change in a gene. According to the US Centers for Disease Control and Prevention, hemophilia occurs in approximately 1 in 5,000 live births. There are about 20,000 people with hemophilia in the US. All races and ethnic groups are affected. Hemophilia A is four times as common as hemophilia B while more than half of patients with hemophilia A have the severe form of hemophilia.
The gene that causes hemophilia is often linked to a personâs sex. Males with the altered gene will have symptoms while females may or may not have symptoms. The chances of inheriting the gene also depend on which parent has the gene and if the child is male or female. There are 3 types of hemophilia: Hemophilia A: Caused by low levels of clotting factor VIII (clotting factor 8). This is the most common type of hemophilia. Hemophilia B: Caused by low levels of clotting factor IX (clotting factor 9).