Basic Statistics for Epidemiology: Prevalence vs Incidence. In short, epidemiology is sort of the who what, when, why, how and where of disease. It doesnât involve any experimentation or clinical trials, so it is really of interest to public health, because it is just about what happens.
So if a queen-sized waterbed with a bladder-type mattress holds roughly 130 gallons of water that weighs in at 1,084 pounds plus the weight of the frame and two people.o keep the math simple let s assume that the mattress, frame and two adults weighs 1,300 pounds and that the bed assembly measures six feet by six feet taking up a total of 36 square feet of floor space. If we divide the weight of the bed by 36 the square footage-that gets us to 36 pounds per square foot.
Water Capacity). This is the weight of the tank if it were filled with water (yes, water). The typical 20-pound (5-gallon) barbeque grill tank would hold 47.6 pounds of water. Regulations limit the propane level to not exceed 42% of the water capacity of the tank. Long story short â the safe maximum weight of propane in a typical barbeque grill tank is 20 pounds (42% of 47.6 or 47.8 pounds).