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.
A quart of water weighs about 2 pounds. The exact weight of the water can vary based on its temperature, but 2 pounds per quart is a reasonable estimate for most common... A quart of water weighs about 2 pounds. The exact weight of the water can vary based on its temperature, but 2 pounds per quart is a reasonable estimate for most common situations. Another way to think about the weight of a quart is in relation to the weight of a gallon of water. A gallon of water weighs about 8 pounds at warmer temperatures. There are 4 quarts in each gallon. Therefore, each quart weighs about 2 pounds for a total of 8 pounds. It's important to note that a gallon actually weighs slightly over 8 pounds in many common situations, 8.3 on average, so a quart generally weighs just over 2 pounds.