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Acute and Chronic Effects : The effects of accidents due to chemicals are severe and immediate on the human body. These effects are called acute effects and can be traced without difficulty. Frequently, poor lab practice or an unsafe system of work will lead to gradual poisoning. At first, effects may go unnoticed; or the effects may be attributed to the wrong cause. It may be hard to trace the real cause of these chronic or long term effects. In some cases, final results could be much worse than the immediate results. For instance, consider the effects of ingested alcohol:
1. Acute effect - drunkenness and vomiting
2. Chronic effect - addiction, liver damage, etc.
Safe lab practice will also minimize chronic effects. An example of good practice is ventilating the lab in the morning; this will minimize immediate poisoning or asphyxia (acute effect) and longer term poisoning (chronic effect) due to inhalation hazards.
When does an atoll start to form? This starts to form when tiny marine animals - coral polyps - attach themselves to rocks on the seabed.
What reacts with zirconium/
Management of Water Resources Management: Management of Water Resources Management of water resources means a programme to provide an adequate supply of good quality of water
Miscellaneous Dangerous Substances : This was introduced in the United Kingdom to identify other hazardous substances and consists of a black exclamation mark on a white backgroun
A field trip to study erosion Find some place in the locality where running water has complete damage by cutting gulleys. Take the class to study the erosion. Why was it caused
Scientific and Technical Achievements of Bronze Age: The major technical advance that accompanied the rise of cities was the discovery and use of metals, particularly coppe
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how is metal tyre fitted on the wheel of bullock cart
Making a precision reflecting telescope It is fairly beyond the scope of this book to include the intricate details for mirror grinding and testing. Though, some teachers may w
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