They use a hygrometer. It measures relative humidity (the amount of moisture in the air) A psychrometer is an example of a hydrometer
The answer to this question would be: ureter
Ureter is the long tubular duct made of epithelial cell that connects the kidney and the bladder. Urine will pass through the ureter to go into the bladder. Urine flow might be obstructed if there was a stoned formed in the kidney. In this case, the patient might feel colic pain to the flank. Urethra will be the tubular organ that goes from the bladder to penis/vagina.
Material Safety Data Sheet (MSDS) is the best place to find information about the hazards that are associated with a compound. It is a document that gives the information on the potential hazards such as health, fire, reactivity and environmental and how to work safely with the chemical products.
-Rosie
The cerebrum
Hope this helps