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.
Bungees make this quick and easy, as you can anchor to a bumper, wheel well, roof rack or other fairly sturdy section of your vehicle. If using water jugs, a single one-gallon jug at 8Â½ lbs. is not enough weight to hold down the corner of a tent. Larger 2Â½ gallon jugs are available, and at 25 lbs. each when filled with water, provide considerably more security. Filling jugs with sand before adding water increases their weight still further.