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Understanding the nano scale…. First: Why not write 0.000000001 meters?. As you know, having a standard for measurement is important…. NANOMETER. What’s the significance of the length of 1 meter?.
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As you know, having a standard for measurement is important… NANOMETER What’s the significance of the length of 1 meter?
The French Academy of Sciences in 1791 decided that the standard length of a meter should be one ten-thousandth of the distance from the Equator to the North Pole. • Originally, marks on a platinum iridium metal bar in Paris were used as the official standard for a meter. • Today, with better technology, the meter is defined as “The length of the path traveled by light in vacuum during a time interval of 1/299 792 458 of a second.”
Did you know… During the reign of Henry the III of England, there was a law called the “Assize of Bread and Ale.” This law stated that anyone caught cheating when selling bread (and other things) to someone could be severely punished. A baker could lose his hand or a finger should it be proven that he short-changed a customer. To guard against being accused of cheating, bakers started adding an extra piece of bread to a customer’s order just to be safe. Thus, if someone ordered a dozen rolls (normally 12) the baker would give them 13 rolls. This was and still is called a Baker’s Dozen (even though our laws are thankfully a lot more lenient now!)
Did you know… In the Middle Ages as a poor peasant your family would have received 3 feet of gold thread from the king each year that you could use to buy food and shelter for you and your family. One member of the family would go to the king to get the thread. During the Middle Ages, a foot was defined as the distance from the back of your heel to the tip of your big toe. Guess which member of the family you’d send…
“Nano” = Greek for “dwarf” So what’s next…picotechnology? Femtotechnology? Attotechnology? Zeptotechnology? Yoctotechnology?
Atoms are approximately 0.1 nanometers and they are the smallest STABLE building blocks. If you start taking apart atoms, you’re talking nuclear…a whole different field. FACT. Nanotechnology has been called the next industrial revolution.
Nanotechnology has been called the next industrial revolution!
FACT. The computers required to navigate a 747 used to take up the same space as a 747.
Metric Conversions…Are you comfortable with them? 4 0.004 meters = ______________ mm 8 x 10-8 80 nm = ______________ m 0.00000008 3000 3 µm = ______________ nm 500,000 5 km = ______________ cm
TWO MAIN METHODS ARE USED FOR CONVERSIONS…what are they? • Moving the decimal • “Kids Have Dropped OVER Dead Converting Metrics” • 1. Find order-of-magnitude difference between prefixes.2. This difference indicates how much to shift decimal point.3. When going from smaller to larger units, make number smaller.4. When going from larger to smaller units, make number larger. • 2. Dimensional Analysis • Use conversion factors and unit cancellation for this technique
Metric Conversions Scavenger Hunt • Rules: • There are 50 conversions on small sheets of paper hidden around the room (HOT PINK). Some are much harder than others. Conversions will be on the front screen—use them! • You cannot look for another conversion until you have solved your current conversion and set it on the front desk with me with you & your partner’s names on the back. • Winning group will get a “prize”. • 1 pt. every right answer, -1 for every wrong answer
Conversions to help you: 1 mile = 1.609 km 1 Gallon = 3.78 Liters 1 inch = 2.54 cm 1 ton= 2000 lbs 12 oz. = 355 mL 1 pound = 0.4536 kg 1 Liter = 1.057 quarts 1 ft = 30.48 cm 1 m = 39.37 in 1 mile = 5280 ft 1 qt = 4 cups 1 cm3 = 1 mL 1 m = 1,000,000,000 nm 1 m = 100 cm 1 km = 1000 m 1 m = 1,000,000 µm 1 m = 10 dm
Chemistry 101: The atom Activity: Constructing an atom out of…
