Hygroscopic substances are used to absorb humidity.
An unknown being weighed is hygroscopic.
Potassium hydroxide is hygroscopic and deliquescent.
those compounds which have ability to absorb water from its surroundings are known as hygroscopic compounds
Hygroscopic
Non-Hygroscopic
In crystalline form it's non-hygroscopic, or has only slight hygroscopicity. In powder form it is, yes.
Absorbs moisture from the atmosphere
Acetone is not known as hygroscopic.
The hair of the tail of horse is hygroscopic material.
Polyol Ester is also hygroscopic
Hygroscopic substances are used to absorb humidity.
An unknown being weighed is hygroscopic.
Potassium hydroxide is hygroscopic and deliquescent.
Then it is possible to measure accurately the weight of it, so you know exactly how many moles of the primary standard you have. When it would have been hygroscopic then your actual mass of the standard is lower than the measured, caused by the extra weight of water.
As far as I know, the PVC is not hygroscopic, it doesn't absorb the moisture. There are several types of PVC though, so there could be some hygroscopic PVC resin, but I haven't encountered it yet. Normally it is dried by hot air driers, which are not suitable for hygroscopic materials, therefore I assume PVC is not hygroscopic...
No.