Write correlated word:
1. Point source of light : Umbra :: Extended source of light : ……………….
2. Sound frequency :Heartz :: Sound level : ……………..
3. Hard water : Sodium salt :: Soft water : ……………….
4.Skeletal muscles : Voluntary muscles :: ……………. : Involuntary muscles
Answers
Answer:
The simple definition of water hardness is the amount of dissolved calcium and magnesium in the water. Hard water is high in dissolved minerals, largely calcium and magnesium. You may have felt the effects of hard water, literally, the last time you washed your hands. Depending on the hardness of your water, after using soap to wash you may have felt like there was a film of residue left on your hands. In hard water, soap reacts with the calcium (which is relatively high in hard water) to form "soap scum". When using hard water, more soap or detergent is needed to get things clean, be it your hands, hair, or your laundry.
Answer:
point source of light : extended source of light
spund frequency :hertz
hard water : soft water
skeletal muscles : voluntary muscles