Well, in physics, momentum is a vector, and it is a product between the mass of a particle and its velocity.
物理中，动量是矢量，它产生于,由粒子的质量与速度。
Two new looks at the gamma-ray sky suggest that if the mysterious matter is a particle, it is heavier than 40 gigaelectronvolts, about 44 times the mass of a proton.
两项最新伽马射线天空图的观测研究表明如果此种神秘物质是粒子，则要大约是一个质子质量的44倍，比400亿电子伏还重。
What physicists are basically doing is making the collisions as powerful and as efficient as possible to turn particle mass into pure energy (as a result of Einstein's bedrock equation E=mc2).
物理学家们做的这些事的本质就是尽可能让这些对撞充满能量并且高效以使这些粒子的质量转换为纯能量（这是爱因斯坦颠补不破的方程E=mc2的结果）。
Asquith, like many physicists, spends a lot of time thinking about particles like the elusive Higgs boson - the subatomic particle that scientists say endows everything in the universe with mass.
阿斯奎斯像其他许多物理学家一样花了很多时间来思考像希格斯玻色子那样难以捉摸的微粒子——被科学家推测其普遍存在于大自然万物中的一种微粒子。
A subatomic particle with the same mass as the electron but positive charge (it is the antiparticle of the electron).
与电子的质量相等但带正电荷的亚原子粒子(是电子的反粒子)。
Steve Weinberg, a doyen of particle physics who was one of the Model's architects, has described neutrino mass as the most important discovery in particle physics for a quarter of a century.
粒子物理学的资深研究者——史蒂夫·温伯格，他也是标准模型的创建者之一，称中微子质量的发现是四分之一个世纪以来，粒子物理学界最重要的发现。
Components or articles are produced by forming a mass of powder into a shape, then consolidating to form inter-particle metallurgical bonds.
通过将大量的粉末放入模具成型为零件或物品，然后合成为内有微粒的冶金结合物。
Equations of mass, momentum and second moments for particulate phase are derived from a particle PDF (probability distribution function) equation in dilute turbulent sediment-laden flows.
从颗粒运动的PDF(概率密度分布函数)输运方程出发建立颗粒相的质量、动量和脉动速度二阶矩方程。
The important result of the relation of the inverse ratio of square through calculating the gravitation of a ball shell with uniformly-distributed mass on a particle.
通过计算质量分布均匀的球壳对一质点的引力，验证了平方反比关系的重要结果。
A laser based technique is proposed which is able to measure and supervise the mass concentration and particle size of smoke and dust in emissions.
提出了能直接测量烟尘和粉尘排放浓度和粒径大小的激光监测技术，具有实时快速、非接触、在线、无需取样和连续测量的优点。
A hypothetical particle postulated to be the quantum of gravitational interaction and presumed to have an indefinitely long lifetime, zero electric charge, and zero rest mass.
引力微子一种假想粒子，被假定为引力相互作用的量子，并被推测为具有。
A model for measuring aerosol mass concentration by an optical particle counter is presented using the conception of the average mass.
基于平均质量的概念，提出了粒子计数器测量悬浮颗粒物质量浓度的计算模型。
According to the principle of the mass balance and constant volume sampling, a full-flow dilution tunnel particle sampling system was designed and adjusted.
本课题按照定容取样方法和质量平衡原理，自行设计、制造、调试了中国首套全流稀释风道颗粒物测试系统。
Abstract :Based on the combination of experiments and numerical simulations, the plastic properties of a 91%(mass fraction, the same below) refined particle tungsten alloy were investigated.
通过实验方法和分子动力学模拟方法研究了91%（质量分数，下同）细化颗粒钨合金材料的塑性力学问题。
However, a lighter, "warm" dark-matter particle would make only big clumps and therefore might explain the lack of galaxies at the low-mass end.
然而，较轻的“温”暗物质粒子只会形成大型物质块，因此可以说明超出这个最低质量限度时就不存在星系。
From the wave-particle properties of photon, the author presents a method with which the static mass of photon can be deduced to zero.
给出了由光子的波粒二象性推导光子静止质量为零的一种方法。
The neutrino mass, which plays an important part in particle physics, cosmology and astrophysics, was a problem unsolved at the end of the 20th century.
中微子的静质量是2 0世纪末物理学中一个有待解决的重要问题，它在粒子物理学、宇宙学和天体物理学中占有重要的地位。
The possible tracks of a particle BXm_(2), sliding down along a free movable concave surface with the mass m_(1) are analyzed.
运用质心运动定理，分析了质点在可自由移动的凹曲面上滑下时，质点对惯性系的运动轨迹方程。
The possible tracks of a particle BXm_(2), sliding down along a free movable concave surface with the mass m_(1) are analyzed.
运用质心运动定理，分析了质点在可自由移动的凹曲面上滑下时，质点对惯性系的运动轨迹方程。
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