1
Technology / Re: What are the best options for webstore Credit Card processing?
« on: 09/06/2023 04:10:54 »
thank you so much for all your suggestions
This section allows you to view all posts made by this member. Note that you can only see posts made in areas you currently have access to.
In principle, the achieveable precision of an evacuable balance is limited by the rate of evaporation or radioactive decay of the sample. In practice, microgram resolution of laboratory samples (i.e. about 1 part in 109) is usually adequate for the task, but the systematic uncertainty of the International Prototype Kilogram exceeds the sensitivity of the best balances, so whilst you might compare two masses to better than 1 in 109, you wouldn't know them to better than 1 in 107. Hence the reason for the recent redefinition of the kilogram.Hello. I just want to know. When the number on the scale shifts between, say, 8.9955 and 8.9956 without settling on one or the other, which do I use?
Specifically, I'd expect to routinely resolve a gram of reasonably dense material to ± 10μg with professional laboratory equipment. To do better (~1 g of pyrolytic graphite ± 0.5 μg) I've used an evacuated Cahn Electrobalance, but here we are talking about evaporation limits and investigative physics and engineering rather than everyday chemistry.