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 * Period of existence or persistence. The metric system unit for this quantity is "s" (second). 036 * 037 * The second, symbol s, is the SI unit of time. It is defined by taking the fixed 038 * numerical value of the caesium frequency ∆νCs, the unperturbed ground-state 039 * hyperfine transition frequency of the caesium 133 atom, to be 9 192 631 770 when 040 * expressed in the unit Hz, which is equal to s⁻¹. 041 * 042 * This definition implies the exact relation ∆νCs = 9 192 631 770 Hz. Inverting this relation 043 * gives an expression for the unit second in terms of the defining constant ∆νCs: 044 * 045 * 1 Hz = ∆νCs / 9 192 631 770 or 1 s = 9 192 631 770 / ∆νCs 046 * <br> 047 * <dl> 048 * <dt><span class="strong">API Note:</span></dt><dd>SI Base Unit</dd> 049 * </dl> 050 * 051 * @author <a href="mailto:werner@uom.technology">Werner Keil</a> 052 * @author <a href="mailto:thodoris.bais@gmail.com">Thodoris Bais</a> 053 * @version 2.1 054 * @since 1.0 055 * 056 * @see Frequency 057 * @see Speed 058 * @see Acceleration 059 * @see ElectricCurrent 060 * @see Power 061 * @see <a href="https://en.wikipedia.org/wiki/Unit_of_time">Wikipedia: Unit of time</a> 062 */ 063public interface Time extends Quantity<Time> { 064}