Powers of TenFrom Meters to Nanometers and Beyond

Rob Snyder and Mort SternheimJuly 2011

Go Down the Powers of Tens Scale

• Use a variety of instruments to collect data about progressively smaller dimensions.

• Use scientific notation to describe and compare dimensions.

• Compare measurements with the dimensions of nanoscale structures.

A Powers of Ten Data Table has room for 14 progressively smaller measurements or calculations

The measurement Meters Centimeters Nanometers

X 100 X 102 X 109

X 100

The first challenge is to determine how many rows of data can be filled using the available measurement instruments.

The second challenge is to provide entries for remaining row and record data in the nanoscale and subnanoscale rows.

Common items can be used to enter data on the Powers of Ten Data Table.

Magnifiers help obtain the last significant digit in a measurement.

A USB microscope can be used to measure the openings in coffee filters and sizes of coffee grounds so that measurements can be recorded on the data table.

Students learn how to calibrate a measurement that utilizes imaging technology.

Spectrometers can be used to add more data.

Students may notice wavelengths of visible light approach the nanoscale realm.

The student activity document provides descriptions of structures that have dimensions smaller than the wavelengths of visible light.

That information can be used to provide a complete set of data.

The activity document includes description of filters with openings as small as one

nanometer.

http://www.sciencedaily.com/releases/2008/02/080222095403.htm

Students can learn that ions have a diameter smaller than a nanometer.

Source: http://en.wikipedia.org/wiki/Ionic_radius

A picometer (pm) = 1 x 10-12 meters

An activity adapted from Nanosense is available at several stations explores even

smaller powers of ten.

• The activity – http://nanosense.org/activities/sizematters/sizeandsca

le/SM_Lesson2Teacher.pdf• On STEM Ed web sites

– www.umassk12.net/nano/Saturday• Other useful nanoscience materials

– http://nanosense.org/index.html

How do we generate images of structures with nanoscale dimensions?

Tomorrow, you will build a model that simulates measurements made with a device called an

Atomic Force Microscope..

A Few Questions

• How well does an activity like this develop a nanoscale perspective?

• Where can this type of activity be integrated into your STEM curriculum?

• What skills and perspectives developed during this activity support the study of other STEM topics?