TI-Nspire™ – Unit System – Units and Physical Constants

  • Units are marked with an underscore separated from other characters, for example _m, _cm, _mm, _eV.
  • Most units follow typical notation, but due to naming conflicts, some differ from standard symbols. For example, _g represents gravitational acceleration, while _gm means gram.
  • TI-Nspire automatically retrieves the values of constants in calculations, such as _g, _h, and _c.
  • TI-Nspire converts input values to base units automatically and performs calculations using them.
    • The result will be correct even if the expression contains mixed units.
    • If the final result is desired in a different unit, append a conversion operator (arrow-template or @>) and the target unit.

You can also use the guided unit conversion assistant!

* Temperature units °C and °F are an exception, as the system cannot detect whether the value represents a temperature or a temperature difference. Therefore, they are not converted automatically.

Examples

Basic unit conversions

Use unit symbols such as _cm or _J for calculations. The triangle symbol arrow for conversions can be typed using @> on the keyboard.

Physical constants in calculations

Use predefined physical constants like _g, _c and _u directly in your calculations. You can convert between units using the triangle symbol arrow, typed with @>.

Unit conversions & Ideal Gas Law

Use unit conversions in combination with physical formulas. Constants like _Vm and _Rc can be inserted from the Unit Conversions menu.

Unit conversions & Velocity selector

In Notes, you can perform unit-aware physics calculations using symbols like _T and _kV.

Car Jack Power and Efficiency

In basic physics calculations, the Notes application can be used to structure and compute the solution. Write the formula in one Math box and the actual calculation in another. Automatic units can be used if desired.

Solving an Equation in Physics

In physics problems, the solve command can be used to determine the unknown variable. The equation can be solved in general form or the given values can be substituted directly. If the same numerical values must be substituted in several places, this can be done using the | notation at the end of the expression. Note that TI-Nspire does not distinguish between uppercase and lowercase letters as different variables in calculations.

See more

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