In science we often asked what happened based on what would happen. The next idea and the earlier time involved. Time plays an essential role in science. We also need a way to describe the size of the whole solar system from our small bacteria. Physical science, as described by the length of the size. This section is the way to measure the scientist and communicate information about time and length.
Two meanings for time
A bell? There are two important meetings during the time (Figure1.6). A meaning is marked in a past or a specific moment in the future. For example, your 18th birthday party says 1 January 2010 at 2:00 pm In order to start your party, mark a specific moment in the future. In this way "time" is usually used in everyday conversation. You may think of this as a historical time. If you ask, "How much time is it?" If you usually want to mark a moment in historical times To answer the questions, you look at a calendar, watch or your watch.
How much time The second meaning is described in an amount quantity. For example, it is said that marks a class for 45 minutes; 45 minutes If you ask, "How much time?" (For example something happened), you are looking a lot of time. To answer, you should measure a period of time, both beginning and ending. For example, you can measure how much time you've started on a race and how much time the first runner crosses the finish line. An amount of time is often called a time interval. A microwave oven (Figure 1.7) with a built-in clock displays both: Historical time and time intervals. In physical science, the word "time" will usually mean a time interval instead of a historical time.
Figure 1.6: There are two different ways to understand the time.
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Figure 1.7: A microwave oven can understand time between both mixed units (minutes and seconds) or unit units (seconds). Both 1:30 and 0:90 can be the same cooking time.
