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Informations (System of Units Brazil -> United States)

  1. Feb 10, 2013 #1
    Google Translator.: (Portuguese(Brazil) -> English(U.S.A))

    Hello, good morning.
    I live in Brazil (South America).
    I'm doing research for the course in production engineering.
    I found that in Brazil, we use the international system of units (http://en.wikipedia.org/wiki/International_System_of_Units).
    And in "United States", using the imperial system (http://en.wikipedia.org/wiki/Imperial_units).

    I need to know what changes in:
    - Physics (http://en.wikipedia.org/wiki/Physics)
    - Calculation (http://en.wikipedia.org/wiki/Calculus)
    - Thermodynamics (http://en.wikipedia.org/wiki/Thermodynamics)
    - Strength of Materials (http://en.wikipedia.org/wiki/Strength_of_Materials)
    - Transport Phenomena (http://en.wikipedia.org/wiki/Transport_Phenomena)
    - Industrial Metrology (http://en.wikipedia.org/wiki/Metrology)
    - Fluid-Mechanical Systems (http://en.wikipedia.org/wiki/Mechanical_engineering)

    I need to know the measurement system you use in the United States for all these matters.
    Brazil: We use the "International System of Units (SI)", the measures are:
    - Kilometers (km), meters (m), centimeter (cm),
    - In physics:
    International System of Units (SI) - Brazil:
    Meter (m), kilometers (km), centimeter (cm), millimeter (mm), meters per second (m / s ^ 2).

    Imperial System - United States:

    I wonder if someone could pass me one by one, "all" systems (measures, derivatives, etc..) Used in each of these matters above, in the United States.

    Thank you.


    Babylon Translator.: (Portuguese(Brazil) -> English(U.S.A))

    Hello, good day.
    I live in Brazil (South America).
    I am doing a research for the production engineering course.
    I have noticed that in Brazil, we use the international system of units (http://en.wikipedia.org/wiki/International_System_of_Units).
    AND in "United States", using the imperial system (http://en.wikipedia.org/wiki/Imperial_units).
    We need to know what changes in:
    - Physical (http://en.wikipedia.org/wiki/Physics)
    - Calculation (http://en.wikipedia.org/wiki/Calculus)
    - thermodynamics (http://en.wikipedia.org/wiki/Thermodynamics)
    - resistance of materials (http://en.wikipedia.org/wiki/Strength_of_Materials)
    - phenomena of Transport (http://en.wikipedia.org/wiki/Transport_Phenomena)
    - Industrial Metrology (http://en.wikipedia.org/wiki/Metrology)
    - Systems fluid-mechanical (http://en.wikipedia.org/wiki/Mechanical_engineering)
    need to know the system of measures that you in the united states use to all of these matters.
    For example:
    Brazil: We use the International System of Units (SI), the steps are:
    - kilometer (km), metro(m), centimetre (cm)

    - in physics:
    International System of Units (SI) - Brazil:
    Metro(m), kilometer (km), centimetre (cm), millimeter (mm), meter per second(m/s^2).

    Imperial System - United States:

    I would like to know if someone could pass one by one, "all" the systems (measures, derived from, etc. ) used in each field of these above, in the United States.
    Thank You
  2. jcsd
  3. Feb 11, 2013 #2


    User Avatar
    Gold Member

    engbianco, seja bem vindo (Welcome) to Physics Forums.

    In the USA most everyone must use both systems of measurements. It is true that many scientists and engineers use the metric system (SI) in their work. But when they drive in their cars to their homes they measure the distance in miles. When they measure their weight they use pounds. When they measure temperature inside their homes they use the Fahrenheit temperature scale.

    I live in Brasil and own a Museum and a Nature Preserve. Hectares, kilometers, and grams are mostly unknown to Americans. Many years ago in Tocantins I went to buy some nuts and bolts and the sales guy told me they were measured in "polegadas". I had to go home and use the dictionary to discover this translated in English to "thumbs". Americans call these archaic things inches. And they measure their height using feet, after some ancient king's foot size.

    So, all the areas you've listed may be measured in either Imperial or International in the USA. Americans must be able to convert from one to the other continuously.


    ps: I am fluent in Portuguese, but here on Physics Forums our rules require us to use only English.
  4. Feb 11, 2013 #3
    Just consider the USA system of measure as being obsolete.
    It works better that way.

    Anyone worth talking to on this planet in this century, will understand the metric system ( SI ).
  5. Feb 11, 2013 #4

    jim hardy

    User Avatar
    Science Advisor
    Gold Member

    English system of weights and measures has a rich history.
    It's illogical, because each specialized trade thought up their own units and many persist to this day. Some go clear back to Roman times.

    US system is very similar but not identical.

    for example : A US gallon is smaller than an Imperial gallon, something to do with trade in colonial times.

    So far as i know , Anvils are still marked in "stones".... gunpowder is weighed in "grains"....a fluid ounce is the volume of about an ounce(weight) of water....

    I would not attempt to name, let alone tabulate them all.

    here's two pretty good articles:

    you might want to print both.
    Have fun !

    old jim
  6. Feb 11, 2013 #5


    User Avatar
    Gold Member

    Meters and kilograms are not just a craze
    That the world is metric doesn’t seem to faze
    The US and England who remain in a daze
    Confined to their islands immersed in a haze
    At two ostriches the world continues to gaze

    Cheers, Bobbywhy
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