abstract
| - Although fiction set in the present-day United States tends to use imperial units, fiction set in the future is more likely to instead use the metric system. This may be because it makes things seem more futuristic: scientists use SI units (which is based on the metric system), and - given that most other countries, except Myanmar and Liberia, officially use the metric system - it may be only a matter of time until the United States also changes to metric. While futuristic science fiction embraces this trope, futuristic fantasy often averts it: imperial measurements seem more appropriate for a non-scientific milieu. The metric system is at least for scientific applications superior to the imperial system - water freezes at 0 degrees Celsius and boils at 100 degrees Celsius, and 1 Calorie is the energy required to increase the temperature of 1 liter (which is also 1 kilogram) of water by 1 degree Celsius. Thus, it's not surprising that the United States actually does use the metric system already, in military and scientific endeavors, as well as on pharmaceuticals and nutritional information. (For example, soft drinks commonly come in 2- or 3-liter bottles.) In fact, the United States' measurements (not imperial - that would be British, and there are differences, e.g. 1 imperial gallon equals 1.20095 U.S. liquid gallons) are defined in metric units in relevant legislation. Further details can be found on That Other Wiki. Just to note, the United States is one of only three countries, along with Burma (Myanmar) and Liberia, that have not adopted the SI (metric) as their official system. So it is generally considered only a matter of time. Overlaps with Unit Confusion. Examples of The Metric System Is Here to Stay include:
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