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MEASUREMENT. CHOOSING THE CORRECT TOOL CALCULATED UNITS READING MEASUREMENTS TEMPERATURE CONVERSIONS ESTIMATING METRIC CONVERSIONS.

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measurement

MEASUREMENT

CHOOSING THE CORRECT TOOL CALCULATED UNITS

READING MEASUREMENTS TEMPERATURE CONVERSIONS

ESTIMATING METRIC CONVERSIONS

si measurement
SI measurement
  • Le Système international d'unités
  • The only countries that have not officially adopted SI are Liberia (in western Africa) and Myanmar (a.k.a. Burma, in SE Asia), but now these are reportedly using metric regularly
  • Metrication is a process that does not happen all at once, but is rather a process that happens over time.
  • Among countries with non-metric usage, the U.S. is the only country significantly holding out. The U.S. officially adopted SI in 1866.

Information from U.S. Metric Association

measurement and significant figures
Measurement and Significant Figures
  • Every experimental measurement has a degree of uncertainty.
  • The volume, V, at right is certain in the 10’s place, 10mL<V<20mL
  • The 1’s digit is also certain, 17mL<V<18mL
  • A best guess is needed for the tenths place.
volume displacement
Volume Displacement

A solid displaces a matching volume of water when the solid is placed in water.

33 mL

25 mL

the top loading balance
The Top Loading Balance
  • These balances are used when an accuracy of +/- 0.1 g is sufficient.
  • Before weighing check that the balance is displaying grams.
  • Zero or Tare the balance by pressing on the Zero button.
calculations using temperature
Calculations Using Temperature
  • Generally require temp’s in kelvins
  • T (K) = t (˚C) + 273
  • Body temp = 37 ˚C + 273 = 310 K
  • Liquid nitrogen = -196 ˚C + 273 = 77 K
slide26

Why is this

stuff important?

density an important and useful physical property

Platinum

Mercury

Aluminum

DENSITY - an important and useful physical property

13.6 g/cm3

21.5 g/cm3

2.7 g/cm3

slide28
Problem

A piece of copper has a mass of 57.54 g. It is 9.36 cm long, 7.23 cm wide, and 0.95 mm thick. Calculate density (g/cm3).

learning check
Learning Check

Osmium is a very dense metal. What is its

density in g/cm3 if 50.00 g of the metal occupies

a volume of 2.22cm3?

1) 2.25 g/cm3

2) 22.5 g/cm3

3) 111 g/cm3

learning check1
Learning Check

What is the density (g/cm3) of 48 g of a metal if the metal raises the level of water in a graduated cylinder from 25 mL to 33 mL?

1) 0.2 g/ cm3 2) 6 g/m3 3) 252 g/cm3

33 mL

25 mL

learning check2
Learning Check

Which diagram represents the liquid layers in the cylinder?

(K) Karo syrup (1.4 g/mL), (V) vegetable oil (0.91 g/mL,)

(W) water (1.0 g/mL)

1) 2) 3)

K

W

V

V

K

W

W

V

K

learning check3
Learning Check

If blood has a density of 1.05 g/mL, how many liters of blood are donated if 575 g of blood are given?

1) 0.548 L

2) 1.25 L

3) 1.83 L

learning check4
Learning Check

A group of students collected 125 empty aluminum cans to take to the recycling center. If 21 cans make 1.0 pound of aluminum, how many liters of aluminum (D=2.70 g/cm3) are obtained from the cans?

1) 1.0 L 2) 2.0 L 3) 4.0 L