Physical Quantities, Measurement Systems, and Unit Conversions

Fundamentals of Physical Quantities and Measurement

  • Physical Quantities (Magnitudes Físicas):

    • Properties of an object, body, or physical system that can be measured.
    • Expressed using a combination of a numerical value (number) and a standard unit of measurement.
    • Example: 60 km60\,\text{km} (where 6060 is the numerical quantity and km\text{km} is the unit of measure).

  • Measurement (Medición):

    • The physical or quantitative process of comparing an unknown magnitude with a standard unit pattern (unidad patrón).
    • Serves to indicate precisely how much of a physical quantity is present.

  • International System of Units (SI):

    • The global organization and standard framework responsible for standardizing measurement units.
    • Ensures uniform global understanding so that standard quantities—such as a meter or a second—have identical definitions everywhere.

  • Documented Entry Date: 27 agosto 2026.

Fundamental Quantities and SI Base Units

  • Fundamental Quantities (Magnitudes Fundamentales):

    • Basic physical quantities that cannot be decomposed or reduced into simpler constituent quantities.
    • Serve as the essential base for all other physical measurements.

  • Standard SI Base Units:

    • Mass (Masa):
    • Unit: kilogram (kilogramo)
    • Symbol: kgkg
    • Length (Longitud):
    • Unit: meter (metro)
    • Symbol: mm
    • Time (Tiempo):
    • Unit: second (segundo)
    • Symbol: ss
    • Temperature (Temperatura):
    • Unit: Kelvin (Kelvin)
    • Symbol: KK
    • Luminous Intensity (Intensidad luminosa):
    • Unit: candela (candela)
    • Symbol: cdcd
    • Electric Current (Corriente eléctrica):
    • Unit: ampere (ampere)
    • Symbol: AA
    • Amount of Substance (Cantidad de sustancia):
    • Unit: mole (mol)
    • Symbol: molmol

Derived Quantities and SI Derived Units

  • Derived Quantities (Magnitudes Derivadas):

    • Quantities formed by mathematically combining fundamental base quantities.
    • Depend directly on one or more basic fundamental quantities.

  • Standard SI Derived Units:

    • Volume (Volumen):
    • Unit: cubic meter (metro cúbico)
    • Symbol: m3m^3
    • Density (Densidad):
    • Unit: kilograms per cubic meter (kilogramos por metro cúbico)
    • Symbol: kg/m3kg/m^3
    • Velocity (Velocidad):
    • Unit: meters per second (metros por segundo)
    • Symbol: m/sm/s
    • Force (Fuerza):
    • Unit: Newton (Newton)
    • Symbol: NN
    • Base physical expression: kg⋅m/s2kg \cdot m/s^2
    • Energy (Energía):
    • Unit: Joule (Joule)
    • Symbol: JJ
    • Base physical expression: kg⋅m2/s2kg \cdot m^2/s^2
    • Pressure (Presión):
    • Unit: Pascal (Pascal)
    • Symbol: PaPa
    • Base physical expression: N/m2=kg/(m⋅s2)N/m^2 = kg/(m \cdot s^2)

  • Documented Entry Date: 27 agosto 2026.

The English System of Measurement

  • English System (Sistema Inglés):

    • A conventional system of measurement utilizing standardized base units for primary physical magnitudes.
    • Documented Entry Date: 28 agosto 2026.

  • Primary Magnitudes in the English System:

    • Length (Longitud):
    • Unit: foot (pie)
    • Symbol: ftft
    • Weight (Peso):
    • Unit: pound (libra)
    • Symbol: lblb
    • Time (Tiempo):
    • Unit: second (segundo)
    • Symbol: ss

  • Reference Image:Handwritten table of the English System detailing physical magnitudes, units, and symbols

Unit Conversion Factors and Equivalences

  • Length and Distance Conversions:

    • 1 pulgada=2.54 cm1\,\text{pulgada} = 2.54\,\text{cm}
    • 1 pie=30.48 cm1\,\text{pie} = 30.48\,\text{cm}
    • 1 milla=1.609 km1\,\text{milla} = 1.609\,\text{km}
    • 1 metro=100 cm1\,\text{metro} = 100\,\text{cm}
    • 1 cm=10 milıˊmetros1\,\text{cm} = 10\,\text{milímetros}

  • Mass and Weight Conversions:

    • 1 libra=454 gramos1\,\text{libra} = 454\,\text{gramos}

  • Time Conversions:

    • 1 hora=3600 segundos1\,\text{hora} = 3600\,\text{segundos}