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It seems useless and so direct because you have not designed your own temperature measurement device. Also you have to consider two things here that this law gave 1. Without putting body A, close to body B they are in equilibrium. 2. Body A can also be taken as temperature measured in laboratory so Zeroth law is helping in measurement of temperature of body B without bringing the Body C (thermometer) to the lab which is body A.

@@mechtalk I didn’t mean depict negative view …. I mean rather than naming its zeroth law based of a scientist they can name it something else probably (it’s my own personal opinion. I don’t disrespect anyone. Every law given is important and had some significance and I understand that)

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Go to those who are already running this business.if not directly then through books and experimenting.

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Any material can be used, it depends on your requirement, what qualities do you want in your gear.

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They always do this to scam people into clicking.

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