Posted by **Supaman** on Friday, February 15, 2008 at 5:42am.

The international standard Kilogram in Paris is stored under double bell jars. What is the prupose of the jars?

Is it because the jars create a vacuum to prevent the standard from gaining mass due to oxidation? If so, why double jars? Are there any other reasons?

- Physics -
**Dr Russ**, Friday, February 15, 2008 at 6:01am
An interesting question. I would imagine that the bell jars serve several purposes, for example a) reducing the airborne contaminations that the standard picks up and b) ensuring that the mass is at the same temperature as the room. I believe the mass is stored in atmospheric air.

I know that the standard is periodically cleaned and there is a complicated protocol to do this.

You could try googling for the standard kilogram and see what you can find.

I hope this helps.

## Answer This Question

## Related Questions

- Physics - what is the purpose of the double bell jars that surround the ...
- Physics - One of the more unusual of world wonders is the plain of jars in laos...
- statistics - A machine is designed to fill jars with 16 ounces of coffee. A ...
- math - If 1 bucket + 5 jars = 1 tub, and 3 buckets + 2 jars = 2 tubs, how many ...
- Managerial Finance and Accounting - Santiago’s Salsa in Problem 1-1. The company...
- 5th grade math - A small company packs 12 jars of jlly into each of 110 boxes to...
- english - because people often put thier extra coins in clay jars, they called ...
- Discrete Math - With 50 pennies in three jars labeled A, B and C, how may ways ...
- Amanda - For Francisco Redi's Spontaneous Generation. Which would be considered ...
- 4 - Bobby has 230 marbles to put in jars. He wants the jars to hold either 100 ...

More Related Questions