# Physics

posted by .

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 -

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.

## Similar Questions

1. ### Physics

what is the purpose of the double bell jars that surround the international prototype of the kilogram in Paris?
2. ### Amanda

For Francisco Redi's Spontaneous Generation. Which would be considered the control group of the experiment and which would be the variable group?
3. ### english

because people often put thier extra coins in clay jars, they called the jars pygg banks or pyggy bank. a}complex b)compound c}simple d}run on i thinks its compound
4. ### Physics

One of the more unusual of world wonders is the plain of jars in laos. Several hundred huge stone jars, which do not seem to made from rock, are scattered across the plain. The largest of these jars has a mass of around 6.0 x 10^3 …
5. ### Managerial Finance and Accounting

Santiago’s Salsa in Problem 1-1. The company is currently producing and selling 325,000 jars of salsa annually.The jars sell for \$5.00 each.The company is considering lowering the price to \$4.60. Suppose this action will increase …
6. ### Discrete Math

With 50 pennies in three jars labeled A, B and C, how may ways can you put the pennies in the jars assuming they are identical with at least two pennies in each jar?
7. ### statistics

A machine is designed to fill jars with 16 ounces of coffee. A consumer suspects that the machine is not filling the jars completely. A sample of 8 jars has a mean of 15.6 ounces and a standard deviation of 0.3 ounce. Is there enough …
8. ### math

If 1 bucket + 5 jars = 1 tub, and 3 buckets + 2 jars = 2 tubs, how many jars are equal to 1 tub?