AKSI PARA PELAJAR FORM 4 MENGHADAPI PEPERIKSAAN AKHIR TAHUN..

Bertungkus lumus menjawab soalan yg diberikan..

wajah-wajah yang bakal mengecapi kejayaan...


ambil kesempatan rehatkan badan...letih jual durian kat pasar malam..

dah tak boleh diselamatkan...

senang sangat soalan tu....byk masa boleh tidur...

Untuk Semua Pelajar-pelajar STESMA... GOOD LUCK FOR SPM

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NEW LAB. ASSISTANT:

Dah hampir 2 minggu makmal Sains dapat Pembantu makmal.. Alhamdulillah.. setelah sekian lama tiada penjaga, kini makmak Sains sudah terurus.. nanti saya masukkan gambar Kak Latifah.. Anyway Welcome.. to STESMA..

SELAMAT HARI RAYA

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SELAMAT HARI RAYA

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What is Air Pollution?

Air is the ocean we breathe. Air supplies us with oxygen which is essential for our bodies to live. Air is 99.9% nitrogen, oxygen, water vapor and inert gases.

Human activities can release substances into the air, some of which can cause problems for humans, plants, and animals.
There are several main types of pollution and well-known effects of pollution which are commonly discussed. These include smog, acid rain, the greenhouse effect, and "holes" in the ozone layer. Each of these problems has serious implications for our health and well-being as well as for the whole environment.
One type of air pollution is the release of particles into the air from burning fuel for energy. Diesel smoke is a good example of this particulate matter . The particles are very small pieces of matter measuring about 2.5 microns or about .0001 inches. This type of pollution is sometimes referred to as 'black carbon" pullution. The exhaust from burning fuels in automobiles, homes, and industries is a major source of pollution in the air. Some authorities believe that even the burning of wood and charcoal in fireplaces and barbeques can release significant quanitites of soot into the air.
Another type of pollution is the release of noxious gases, such as sulfur dioxide, carbon monoxide, nitrogen oxides, and chemical vapors. These can take part in further chemical reactions once they are in the atmosphere, forming smog and acid rain.
Pollution also needs to be considered inside our homes, offices, and schools. Some of these pollutants can be created by indoor activities such as smoking and cooking. In the United States, we spend about 80-90% of our time inside buildings, and so our exposure to harmful indoor pollutants can be serious. It is therefore important to consider both indoor and outdoor air pollution.

Reference: http://www.lbl.gov/Education/ELSI/pollution-main.html

Learning About Greenhouse

Have you ever seen a greenhouse? Most greenhouses look like a small glass house. Greenhouses are used to grow plants, especially in the winter. Greenhouses work by trapping heat from the sun. The glass panels of the greenhouse let in light but keep heat from escaping. This causes the greenhouse to heat up, much like the inside of a car parked in sunlight, and keeps the plants warm enough to live in the winter.The Earth’s atmosphere is all around us. It is the air that we breathe. Greenhouse gases in the atmosphere behave much like the glass panes in a greenhouse. Sunlight enters the Earth's atmosphere, passing through the blanket of greenhouse gases. As it reaches the Earth's surface, land, water, and biosphere absorb the sunlight’s energy. Once absorbed, this energy is sent back into the atmosphere. Some of the energy passes back into space, but much of it remains trapped in the atmosphere by the greenhouse gases, causing our world to heat up.