001/*
002 * Units of Measurement API
003 * Copyright (c) 2014-2021, 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}