· The specific Gravity-bottle method
specific gravity bottle is a device used to determine the density of a liquid. This is called the pycnometer. A pycnometer is usually made of glass, with a close-fitting ground glass stopper with a capillary tube through it, so that air bubbles may escape from the apparatus. This device enables a liquid's density to be measured accurately by reference to an
Measurement of Density
The mass is normally measured with an appropriate scale or balance.
The volume may be measured directly (from the geometry of the object) or by the displacement of a fluid.
Hydrostatic weighing is a method that combines these two.
2. Specific Gravity
It is the ratio of the density (mass of a unit volume) of a substance to the density of a given reference materia
Synthesize nitrobenzene by nitration of benzene with mixed acid as one of the EAS’s example
Understand basic operation of concussion mixing, heating, cooling, and drying liquid.
Electrophile
a reagent attracted to electrons that participates in a chemical reaction by accepting an electron pair in order to bond to a nucleophile.
A example of electrophiles
- Lewis acids
(
4) Methods to measure density
Specific gravity-bottle method
Sink-and-float method
Density gradient method
Displacement method
Sink-and-float method
uses heavy, light solvents and a solution that has the same density of our target polymer.
ρ₁ = the density of heavy solvent
ѵ₁ = the volume ratio of heavy solvent
ρ₂ = the density of light solvent
ѵ₂ = the v
Initial Mechanical Clock (14C)
Still, Public Clock,
but could show
what time it was
Non-portable
Accuracy Improving (16C~18C)
1. Gravity-swing pendulum
2.Advance in technology
Escapement
Movement for small clock and watch
3.For navigation
A large prize for accurate clock
Using chronometer in navigation
Propagation of Clock and Watch
Carriage clock
(car
- Storm Force Accelatron
가상 폭풍과 번개를 체험하는 회전형 라이더이다.
- 헐크 코스터(Incredible Hulk Coaster)
괴인간 헐크를 만들어낸 실험실의 감마선 가속기를 탑승한다는 테마로 구성된 철제 회전형 롤러코스터로 일반적인 코스터가 처음에 천천히 올라가는 데 반해 2초안에 40마일(64km)의 속도로 150f
Jane - awakens the morning of her wedding day, rises quickly to dress for the ceremony. Rochester surveys Jane quickly; she is "fair as a lily“, and two dark figures emerge from the back of the church, …
Mr. Biggs and Mr. Mason - object to their marriage since it is a bigamous marriage. Rochester's first wife is Bertha whose brother is Mason, the madwoman living in Mr. Rochester's attic.
-19世紀 英․美詩-
-19世紀 英國詩-
(1) William Blake(1757-1827)
"The Chimney Sweeper", "The Tiger"
(2) William Wordsworth(1770-1850)
"Lines Composed a Few Miles above Tintern Abbey"
(3) Samuel Taylor Coleridge(1772-1834)
"The Rime of the Ancient Mariner", "Kubla Khan"
(4) George Gordon Byron(1788-1824)
"Childe Harold's Pilgrimage(canto1)", "She Walks in Beauty"
(5) P
Violence has always taken a part in entertainment ever since the ancient; we all know well about the popular gladiator games in ancient Rome, for an example. However, it’s said that there’s a great consensus that something about media violence has changed in recent years.
For one thing, there’s more of it. According to Guy Paquette and Jacques de Guise, Laval University professors, afte
apparatus,
against a background light of FIRE, and a deep
rushing of STEAM and HEAVY, DARK ENERGY.
-- And then we see this linkage attached to the glove.
-- Then the BLADES attached to all of it.
-- Then the MANS HAND slips into this glove-like
apparatus, filling it out and transforming
it into an awesome, deadly claw-hand with
four razor/talons gleaming at its blackened
fingertips. Suddenly the