Group:               Name(s)                                                                                                  Date:           

Size and Shape of a Standard Kilogram.

The standard kilogram is a platinum-iridium alloy kept in a laboratory in Paris, France. A picture is available at http://physics.nist.gov/cuu/Units/kilogram2.html.

1. What is your estimate for the dimensions of the standard?

2. Why is it in the shape of a right circular cylinder?

3. Determine accurately the diameter and height of the cylinder.

Thickness of a piece of paper

Determine the thickness of a piece of paper from your text. Be able to describe how you did it. Ask if you need any tools. Give as precise an answer as possible.

Size of a period in the text.

Determine the diameter of a period in the text. Be able to describe how you did it. Ask if you need any tools. Give as precise an answer as possible.

Weighing the air.

Estimate the mass of air in this room.