gal, Gal (unit)

{
    "$id": "https://schemas.optimade.org/defs/v1.2/units/si/1970/temporary/gal",
    "$schema": "https://schemas.optimade.org/meta/v1.2/optimade/physical_unit_definition.json",
    "title": "gal",
    "symbol": "Gal",
    "display-symbol": "Gal",
    "description": "A unit of acceleration equal to 1 centimeter per second squared (1 cm/s\u00b2), defined according to the 1967 SI units.\n\nThe gal unit appears in the International System of Units (SI), 1st ed. (1970) defined as \"1 Gal = 1 cm/s\u00b2 = 10\u207b\u00b2 m/s\u00b2\" with the footnote \"The gal is a special unit of acceleration employed in geodesy and geophysics to express acceleration due to gravity.\"\n\n- The International System of Units (SI), 1st ed. (1970) categorizes the unit as \"units in use temporarily\".\n- The International System of Units (SI), 7th ed. (1998) changes the categorization to \"derived CGS units with special names\".\n- The International System of Units (SI), 9th ed. (2019) moves the unit definition to the margin aside the table for Non-SI units accepted for use with the SI units.\n  It is not clear how to interpret the categorization intended with this placement of the unit.",
    "resources": [
        {
            "relation": "Definition in the International System of Units (SI), 1st Edition",
            "resource-id": "https://www.bipm.org/en/publications/si-brochure"
        },
        {
            "relation": "Wikipedia article describing the unit",
            "resource-id": "https://en.wikipedia.org/wiki/Gal_(unit)"
        }
    ],
    "defining-relation": {
        "base-units": [
            {
                "symbol": "m",
                "id": "https://schemas.optimade.org/defs/v1.2/units/si/1960/base/metre"
            },
            {
                "symbol": "s",
                "id": "https://schemas.optimade.org/defs/v1.2/units/si/1967/base/second"
            }
        ],
        "base-units-expression": "m*s^-2",
        "scale": {
            "exponent": -2
        }
    },
    "x-optimade-definition": {
        "label": "gal_si_1970_temporary",
        "kind": "unit",
        "format": "1.2",
        "version": "1.2.0",
        "name": "gal"
    }
}