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    21 st
                    AM And PM                                                                        Century   #Subject Enrichment
                                                                                                      Skills

                    As explained earlier, the hour hand goes around twice the dial of clock in one day.
                    So, it shows the same time twice in a day. The time between 12 midnight and 12 noon
                    is expressed by ‘a.m.’ (ante meridiem). The time between 12 noon and 12 midnight is
                    expressed by ‘p.m.’ (post meridiem). It is wrong to write 12:00 a.m. or 12:00 p.m. for
                    the time 12 o’clock midnight or noon.

                                                       a.m.                                                       p.m.

                         Soni eats breakfast at 8:00 a.m.                        Moni watches TV at 8:00 p.m.

                    eSTiMATing The TiMe

                      A second is a very short unit of           A minute is equal to            An hour is equal to
                     time. It takes about 1 second to            60 seconds. It takes          60 minutes. It takes a
                       turn on a light or to open the             about 1 minute to           little more than an hour
                           door of a refrigerator.                 brush your teeth.          to play a hockey match.

                                                                                                       21 st
                           Project                                                                   Century   #Subject Enrichment
                                                                                                      Skills
                    Duration of time is measured using various types of clocks, such as a
                    digital clock, analog clock, sand clock, etc. Explore how to work a sand
                    clock and make your own sand clock in the presence of an adult using

                    suitable materials.

                                                                                                                 185
                                                                                                        Time

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