Powders
What is the difference between a powder and granules?
size and shape
What is the difference between interparticle voids and intraparticle voids?
interparticle = spaces or voids between the particles
intraparticle = spaces or voids within individual particles
What does a sieve number represent?
the aperture size and wire diameter necessary to produce a total width of 1 inch
If segregation occurs, is the mixture free-flowing or cohesive?
free-flowing
Which U.S. state is the only one to grow coffee beans?
Hawaii
Powder ________ is defined as the ease with which a powder will flow under a specified set of conditions.
flowability
The total volume is commonly also called ________.
bulk volume
What is the maximum sieve number that would allow all coarse particles to pass?
20
What method of blending involves using a mortar and pestle?
grinding/trituration
What is used to measure the spicy heat of peppers?
Scoville scale
Which method of determining particle size divides the particle into two equivalent sections?
Martin diameter
What kind of relationship do bulkiness and bulk density have?
inverse
How are particle size and the scattering angle of light related?
inversely related
What type of chemical reaction often leads to an explosive mixture?
redox reaction
Where does the Wizard live in "The Wizard of Oz"?
The Emerald City
Moisture content causes powder to flow _______.
less
What is bulk density?
ratio of the mass of powder (m) divided by the total volume of untapped powder (bulk volume, Vb)
m/Vb
What is determined by Stokes' equation?
sedimentation rate (or velocity)
What are the four physical state descriptions of mixtures?
1) random
2) segregation
3) unmixed
4) perfect or ideal
What are the Northern Lights also known as?
Aurora Borealis
__________ is a measure of how much open space there is relative to the total space.
porosity
What is the formula for calculating porosity?
(Vb - V)/Vb
(bulk volume minus true volume) divided by bulk volume
What are the four methods for measuring particle size?
1) microscopy
2) sieving
3) sedimentation rate
4) light scattering
Which mixing methods would not be suitable for powders with poor flowability?
tumbling and sifting
What kind of animal is Punxsutawney Phil?
a groundhog