Most foam is made from polyurethane.
They start by making polyurethane. To make it, you mix a polyol with a diisocyanate. There are many polyols. There are two important isocyanates, toluene diisocyanate and methylene diisocyanate. (Two other diisocyanates are used to make urethane paint.) The choice of polyol governs whether the foam is hard or soft, and how soft or hard it is.
Next, you mix in a blowing agent. The first blowing agent was water, which forms CO2 in contact with diisocyanate. They don't like making insulating foam with water, because the foam doesn't insulate as well.
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Manufacture can be used as a verb and a noun. There is also the gerund manufacturing.
manufacturing is to make or process a raw material into a finished product to manufacture is the act or process of producing something so there is no difference just that manufacturing is a verb & manufacture is a noun
The country of manufacture is where it was built and the country of origin is where it was designed, if there really is a difference.
Kool Aid
Grandma Panties
nicolas-jacques conte
The method that Henry Ford pioneered, that resulted in a new and less expensive way to manufacture cars, is mass production by means of an assembly line technique.
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Eli Whitney
Assembly lines in factories (versus home manufacture), using interchangeable parts.
It totally varies depending on the method of manufacture. A major variable would be the sweetener used.
NH3 (ammonia), N2 (nitrogen) and/or CO2 (carbon dioxide) depending on the method of synthesis.
other industries also sky rocketed.
Your question is very generic. In general no matter where manufacture occurs, provided the manufacture is done properly to a specific quality/standard method, the goods will be of the same quality no matter where they are made. However, the legal regime in China does allow for "fake" low quality manufacture to occur and if the component is "fake" then it will not be good quality.
Frequency Modulation. It is the method of propagating the electromagnetic wave.
The term Proof refers to the method of manufacture and is not a variety. A Proof coin of any denomination is not made for circulation, but to sell to collectors.