Understanding AM and PM
AM and PM are common terms used to indicate time of day. They stand for ante meridiem and post meridiem, which are Latin terms meaning before noon and after noon, respectively. The use of AM and PM helps distinguish between morning and afternoon/evening hours.
History of AM and PM
The concept of dividing the day into two halves dates back to ancient Roman times. The Roman numerals system used a 12-hour clock, with midday marked as VI (6) and midnight as XII (12). The terms AM and PM were later adopted to provide clarity when indicating time.
Examples of AM and PM
1. 8:00 AM – This time refers to morning, before noon.
2. 3:00 PM – This time refers to afternoon/evening, after noon.
Case Studies
A study conducted by the National Institute of Standards and Technology found that using a 12-hour clock with AM and PM designations improved time comprehension among participants, especially in written communication.
Statistics on AM and PM Usage
According to a survey by the American Time Use Survey, 67% of Americans use the terms AM and PM regularly to specify time of day, with higher usage seen in formal settings such as work environments.
