China
Africa
Explore chapters and articles related to this topic
Stress Waves
Published in Paul J. Hazell, Armour, 2023
It is worth mentioning that in the field of shock physics, base SI units are not the most commonly used form of unit. Shock velocities are very fast, and therefore, all velocities are expressed in kilometres per second or millimetres per microsecond. Therefore, times and displacements are expressed as microseconds (μs) and millimetres (mm), respectively. Pressures and stresses are generally extremely high and quoted in gigapascals (GPa). To provide a consistent set of units, density is therefore quoted in grams per cubic centimetre (g/cc) and specific volume in cubic centimetres per gram (cc/g) and so on.
Solids: comparison with experiment
Published in Michael de Podesta, Understanding the Properties of Matter, 2020
The densities of most solids lie in the range between 0.5 and 20 times that of water. Historically, the gram was defined as the mass of one cubic centimetre of water at 4 °C. Thus the density of water lies close to 1 gram per cubic centimetre, or in the rather incongruous SI units, 1000 kg m−3. So solid densities lie in the range from around 500 kg m−3 to around 20000 kg m−3. Table 7.1 gives the density of an arbitrary selection of substances. The density of the elements is recorded in Table 7.2 and graphed as a function of atomic number in Figure 7.1.
The role of pore evolution during supersolidus liquid phase sintering of prealloyed brass powder
Published in Powder Metallurgy, 2020
Somayeh Ghasemi, Maziyar Azadbeh, Mehrdad Mousapour, Ahad Mohammadzadeh, Herbert Danninger, Nushin Salimi
Water atomised prealloyed brass powder Cu–28% Zn was used as the raw material. The details of the powder characteristics and chemical composition are given in Table 1, where chemical composition was measured by hot fusion analysis (LECO TC-400 apparatus). The flowability of powder was analysed by ISO 4490, while the apparent density determined by ISO 3923-1, where the mass of powder was measured in gram per cubic centimetre. The brass powder was mixed with 0.75 wt-% lithium stearate as lubricant in a V-shaped mixer at 65 rev min−1 for a period of 30 min. The resulting powder mix was compacted to cylindrical specimens with a diameter of 10 mm and an initial weight of 7.0 ± 0.01 g for each sample. Compaction was conducted uniaxially in pressing tools with floating die at 6 different pressures. The green density of each sample was determined by measuring mass and dimensions.