- بدأت الحكاية في امريكا الجنوبية وتحديدا في دولة بيرو , واللي وقتها كانت مستعمرة إسبانية
- في...
Origin of plant names II
Linseed, Flax-seed
Latin name: Linum usitatissimum
Linum (=thread)
The Latin name Linum comes from the Celtic, il/in, meaning a thread; the English, linen, refers to the fabric.
usitatissimum...
Origin of plant names part I
Atropa belladonna
Atropa (atropos= rigid, Inflexible, atropos is one of the three goddesses of fates in the Greek mythology)
Belladonna (bella=beautiful , donna= lady)
The name Atropa Belladonna...
Different illumination systems used in microscopes
1- Plain mirror:
Used when a fixed light source is used.
2- Concave mirror:
When skylight is used, this mirror helps to converge the beam onto the condenser.
3-...
Handling of microscope and its structure
A microscope may be defined as an optical instrument , comprising of a lens or a combination of lenses which enables to view magnified images of a minute objects.
Compound microscope
The compound...
Definitions
Buffer
A solution which tends to maintain a constant pH when excess acid or base is added.
Concentrated
For some commonly used acids and bases, the maximum solubility (at room temperature) in an aqueous solution or as a pure liquid.
Concentration...
A Guide to Chemistry Glassware
Basic Glassware: Test tubes, Beakers & Boiling tubes
Boiling tubes:
They aren’t that different from test tubes in appearance, but are used when heating is required , they tend...
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