001/* 002 * Units of Measurement API 003 * Copyright (c) 2014-2023, Jean-Marie Dautelle, Werner Keil, Otavio Santana. 004 * 005 * All rights reserved. 006 * 007 * Redistribution and use in source and binary forms, with or without modification, 008 * are permitted provided that the following conditions are met: 009 * 010 * 1. Redistributions of source code must retain the above copyright notice, 011 * this list of conditions and the following disclaimer. 012 * 013 * 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions 014 * and the following disclaimer in the documentation and/or other materials provided with the distribution. 015 * 016 * 3. Neither the name of JSR-385 nor the names of its contributors may be used to endorse or promote products 017 * derived from this software without specific prior written permission. 018 * 019 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 020 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 021 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 022 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE 023 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 024 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 025 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 026 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 027 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, 028 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 029 */ 030package javax.measure.quantity; 031 032import javax.measure.Quantity; 033 034/** 035 * Extent of something along its greatest dimension or the extent of space between two objects or places. 036 * The metric system unit for this quantity is "m" (metre). 037 * 038 * The metre, symbol m, is the SI unit of length. It is defined by taking the fixed 039 * numerical value of the speed of light in vacuum c to be 299 792 458 when expressed 040 * in the unit m s⁻¹, where the second is defined in terms of the caesium frequency 041 * ∆νCs. 042 * 043 * This definition implies the exact relation c = 299 792 458 m s⁻¹. Inverting this relation 044 * gives an exact expression for the metre in terms of the defining constants c and ∆νCs: 045 * 046 * 1 m = (c / 299 792 458)s = 9 192 631 770 c / 299 792 458 ∆νCs ≈ 30.663 319 c / ∆νCs 047 * <br> 048 * <dl> 049 * <dt><span class="strong">API Note:</span></dt><dd>SI Base Unit</dd> 050 * </dl> 051 * 052 * @author <a href="mailto:jean-marie@dautelle.com">Jean-Marie Dautelle</a> 053 * @author <a href="mailto:werner@uom.technology">Werner Keil</a> 054 * @author <a href="mailto:thodoris.bais@gmail.com">Thodoris Bais</a> 055 * @version 2.1 056 * @since 1.0 057 * 058 * @see <a href="https://en.wikipedia.org/wiki/Length">Wikipedia: Length</a> 059 * @see Area 060 * @see Volume 061 * @see Angle 062 * @see SolidAngle 063 * @see Speed 064 */ 065public interface Length extends Quantity<Length> { 066}