The definition of an active smoker is the one who smokes or has intention to smoke; as for a passive smoker is defined as a person who breathe in the smoke of others.
Definitely, the changes for an active smoker to get cancer is higher than a passive smoker. Howver, this does not mean that a passive smoker will not get cancer. If a passive smoker is surrounding by active smokers everyday and all the time, the chances for him/her to get cancer is there. If s/he has family histories, the chances to get cancer is even higher.
Sometimes you may be surprised why an active smoker does not get cancer in his/her lifetime. This could be that s/he just smokes one or two cigerattes a day and the rest of time s/he is not exposed to smoke. However, if s/he has family histories and smokes a lot everyday, the chances for him or her to get cancer is higher and quicker.
Saturday, September 02, 2006
Monday, April 17, 2006
What is the greenhouse effect?
The greenhouse effect is the rise in tempeture on the surface of a planet caused when the atmosphere trapps heat from the sun and prevents it from dispeasing back to the space. Carbon dioxide is the main greenhouse gas that traps the solar heat.
Solar system
Our solar system consists of the sun and nine planets which are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune and Pluto.
Mercury
It is the closest planet to the sun and has the diameter of 40% smaller than the earth.The orbital period is 87.969 days. It is very hot during the day. The maximum surface temperature is 427 degree celsius and the minimum surface temperature is -173 degree celsius. In the solar system, it is the second smallest planet with the atmosphere is composed of helium (42%), sodium (42%), oxygen (15%) and other (1%).
Venus
It is the second closest planet to the sun. It has similar size and mass as the earth. The orbital period is 224.701 days. The mean surface temperature is 482 degree celsius. The high temperature is due to the heavy contain of carbon dioxide in the atmosphere. The atmosphere is composed of carbon dioxide (96%), nitrogen (3%) and other (1%).
Earth
It is the third planet from the sun and has a diameter of 12,756 kilometers (7,973 miles). It takes 150 million kilometers (93.2 miles) to travel from the earth to the sun. The orbital period is 365.256 days. The mean surface temperature is 15 degree celsius. The atmospheric pressure is 1.013 bar. The atmosphere is composed of nitrogen (77%), oxygen (21%) and other (2%).
Mars
It is the fourth planet from the sun. The atmosphere is composed of carbon dioxide (95.32%), nitrogen (2.7%), argon (1.6%), oxygen (0.13%), carbon monoxide (0.07%), water (0.03%), neon (0.00025%), krypton (0.00003%), xenon (0.000008%) and ozone (0.000003%).
Jupiter
It is the fifth planet from the sun and also the largest one in the solar system. The orbital period is 4332.71 days, the mean temperature -121 degree celsius and the atmospheric pressure 0.7 bars. The atmosphere is composed of hydrogen (90%) and helium (10%).
Saturn
It is the sixth planet from the sun and the second largest in the solar system. It has rings surrouded it and the rings make it the most beautiful planet in the solar system. The orbital period is 29.458 years, the mean temperature -125 degree celsius and the atmospheric pressure is 1.4 bars. The atmosphere is composed of hydrogen (97%) and helium (3%).
Uranius
It is the seventh planet from the sun and the third largest in the solar system. The orbital period is 84.01 years, the mean temperature -193 degree celsius and the atmospheric pressure 1.2 bars. The atmosphere is composed of hydrogen (83%), helium (15%) and methane (2%).
Nepturn
It is the eighth planet from the sun. The orbital period is 164.79 years. The atmosphere is composed of hydrogen (85%), helium (13%) and methane (2%).
Pluto
It is the ninth planet from the sun. The orbital period is 248.54 years.
Mercury
It is the closest planet to the sun and has the diameter of 40% smaller than the earth.The orbital period is 87.969 days. It is very hot during the day. The maximum surface temperature is 427 degree celsius and the minimum surface temperature is -173 degree celsius. In the solar system, it is the second smallest planet with the atmosphere is composed of helium (42%), sodium (42%), oxygen (15%) and other (1%).
Venus
It is the second closest planet to the sun. It has similar size and mass as the earth. The orbital period is 224.701 days. The mean surface temperature is 482 degree celsius. The high temperature is due to the heavy contain of carbon dioxide in the atmosphere. The atmosphere is composed of carbon dioxide (96%), nitrogen (3%) and other (1%).
Earth
It is the third planet from the sun and has a diameter of 12,756 kilometers (7,973 miles). It takes 150 million kilometers (93.2 miles) to travel from the earth to the sun. The orbital period is 365.256 days. The mean surface temperature is 15 degree celsius. The atmospheric pressure is 1.013 bar. The atmosphere is composed of nitrogen (77%), oxygen (21%) and other (2%).
Mars
It is the fourth planet from the sun. The atmosphere is composed of carbon dioxide (95.32%), nitrogen (2.7%), argon (1.6%), oxygen (0.13%), carbon monoxide (0.07%), water (0.03%), neon (0.00025%), krypton (0.00003%), xenon (0.000008%) and ozone (0.000003%).
Jupiter
It is the fifth planet from the sun and also the largest one in the solar system. The orbital period is 4332.71 days, the mean temperature -121 degree celsius and the atmospheric pressure 0.7 bars. The atmosphere is composed of hydrogen (90%) and helium (10%).
Saturn
It is the sixth planet from the sun and the second largest in the solar system. It has rings surrouded it and the rings make it the most beautiful planet in the solar system. The orbital period is 29.458 years, the mean temperature -125 degree celsius and the atmospheric pressure is 1.4 bars. The atmosphere is composed of hydrogen (97%) and helium (3%).
Uranius
It is the seventh planet from the sun and the third largest in the solar system. The orbital period is 84.01 years, the mean temperature -193 degree celsius and the atmospheric pressure 1.2 bars. The atmosphere is composed of hydrogen (83%), helium (15%) and methane (2%).
Nepturn
It is the eighth planet from the sun. The orbital period is 164.79 years. The atmosphere is composed of hydrogen (85%), helium (13%) and methane (2%).
Pluto
It is the ninth planet from the sun. The orbital period is 248.54 years.
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