Weather is the day today conditions(state) of the atmosphere at
any place as regards sunshine, temperature, cloud cover, wind
fog condition, air pressure, humidity, precipitation and such
other elements.
• It refers to short periods like a day, a week, a month or a little
longer and as such the weather changes from time to time in a
day and one period to the other in an year.
• In the morning the weather might be sunny with a clear sky in a
place and evening there might be clouds and rain. Similarly the
weather is cool in winter and hot in summer.
• Scientific study of weather is called Meteorology
• e.g. cricket match have been postponed due to bad weather etc.
• Climate is generally defined as the
average conditions (state) of the weather
of a place or a region.
• The average atmospheric conditions are
determined by measuring the weather
elements for a long period of time which
is usually for 35 years.
• The elements of weather and climate are
the same.
• The climate does not change often like
weather.
• scientific study of climate is called
climatology.
Temperature
• Temperature is one of the key elements of
weather and climate.
• The earth and its atmosphere get heated from
the sun through insolation.
• The degree of heat present in the air is termed
as temperature.
• Apart from sun’s rays, the heat in air also
depends the atmospheric mass to a small
extent.
• Temperature varies with time due to changes in
the level of radiation which reach the earth
surface
வணக்கம் எட்டாம் வகுப்பு சமூக அறிவியல் பாடத்தில் உள்ள Quarterly portion map கீழே PDFவடிவில் கொடுக்கப்பட்டுள்ளது பயன்படுத்திக் கொள்ளுமாறு கேட்டுக் கொள்ளப்படுகிறார்கள்
•Temperature varies both horizontallyand vertically.
•Temperature decreases with increasingheight is known as Lapserate which is 6.5 degree celsiusper 1000 meters in troposphere.
•The temperature influences the level of humidity, the processof evaporation, condensation and precipitation
• The average of maximum and minimum
temperatures within 24 hours is called mean
daily temperature [(87oF+73oF)/2=80oF].
• Diurnal range of temperature is the
difference between the maximum and
minimum temperatures of a day.
• Annual range of temperature is the
difference between the highest and lowest
mean monthly temperatures of a year.
• The distribution of temperature is shown by
means of Isotherms. Isotherms are
imaginary lines which connect the same
temperatures of different places.
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