Friday, 17 February 2012

grade V

Elapsed time is the time between the start time and end time. Elapsed time in 10am to 2pm is 4 hours as the time present in between the start time 10 am and end time 2pm is 4 hours. Elapsed time is calculated by counting the number of hours within the start time and end time. While calculating the elapsed time it is always important to notice the time unit whether it is morning (am) or evening (pm).AM means anti- meridiem and PM means post-meridiem which is nothing but 12:00 A.M. and 12:00 P.M. respectively.
A.M is the part of the day that starts immediately after mid night which is morning and P.M is the part of the day that starts immediately after mid day and that is afternoon. A.M. and P.M. are generally used in twelve hour clock, in order to avoid confusion many use a 24 hour clock in which 1 P.M is referred to as 13th hour and so on till the 24th hour of the day. Here are a few examples to show elapsed time clearly:

S.NO START TIME END TIME ELAPSED TIME
1 06.00 PM 8.30 PM 2 HOURS 30 MINUTES
2 04.00 AM 10.30 AM 6 HOURS 30 MINUTES
3 03.00 PM 12.00 AM 9 HOURS








Temperature is a property through which heat is measured. A body is said to be at low temperature if it is cold. It is measured in degrees Celsius and Fahrenheit’s body is said to be at a high temperature if it is hot. Heat always flows from a hot body to a cold body. When a hot metal is placed in cold water the heat from the hot metal flows into the water and the water becomes hot and the metal becomes cold after some time this is because of flow of heat from the metal to the water which is nothing but transfer of energy. As heat is a form of energy it flows from a hot body to a cold body (also read Newtons law of cooling formula). The concept of temperature is used very often in our daily life. We measure the weather condition through degrees of temperature and also temperature of our body is again an important concept which we see in a daily life. The normal temperature of human body is considered to 98.6 degrees Celsius, if the temperature is above or even 100 degrees Celsius then it means that the person is suffering from fever and high temperature occurs only when someone suffers any diseased condition. Water forms ice when it is at zero degrees Celsius, when ice is heated (which means that the temperature of ice is increased) then, it forms water. Fahrenheit and Celsius are the scales used to measure temperature. Heat is an energy that transfers itself from one body to another. It is a form of kinetic energy in an object or a substance. Even though temperature and heat are almost the same they are not the same .the difference between temperature and heat is temperature is form of internal energy that is present in a system while heat is form of energy that is transferred from one body to another. Heat flows but temperature does not flow it remains in the same body. Temperature is measured using a thermometer or a calorimeter. The Kelvin scale is a scale used to measure temperature in physics. When it is adjusted to zero degrees Kelvin then is called as absolute zero in physics. Math Problems based on conversion of one unit of temperature to another are given in physics and chemistry. K = °C +273 this is the formula used for kelvin.98.6 °F = 37.0°C = 310 K where F is Fahrenheit’s is Celsius or centigrade and K is Kelvin.

In upcoming posts we will discuss about Mean and median in Maths. Visit our website for information on 12th biology syllabus Maharashtra board

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