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Caustic soda, also known as sodium hydroxide, is a strong alkali used in various industrial processes and cleaning operations. Its "activity" or effectiveness does not diminish over time if stored properly, in airtight containers away from moisture, as moisture initiates its reaction and reduces its potency. In solution, caustic soda remains active until it has reacted with substances such as acids or organic materials, neutralizing in the process. Therefore, the shelf life of solid caustic soda is virtually indefinite under ideal storage conditions, while its activity in solution is dependent on its exposure to reactive substances.
Oil viscosity numbers, found on lubricants like motor oil, describe the fluid's resistance to flow. The Society of Automotive Engineers (SAE) grading system divides oils into "W" for winter (indicating low temperature fluidity) and non-W grades for high temperature performance. For example, a 10W-30 oil flows like a 10-grade oil in cold temperatures but protects like a 30-grade oil at high temperatures. The first number (10W) shows how easily the oil flows at cold temperatures, while the second number (30) indicates the oil's thickness at high temperatures. This system helps consumers select the appropriate oil, ensuring the engine runs smoothly across a range of temperatures.
When comparing the strength of titanium to tungsten, it's important to clarify the types of strength being considered: tensile strength, toughness, or hardness. Tungsten, with the highest melting point of all metallic elements and exceptional tensile strength, is undoubtedly strong in terms of withstanding high temperatures and resisting deformation under compression. However, titanium excels in tensile strength, the measure of a material's resistance to breaking under tension, and also showcases superior toughness, which is its ability to absorb energy before fracturing. Furthermore, titanium's strength-to-density ratio is notably high, making it incredibly strong for its weight. On the other hand, tungsten is one of the hardest materials in existence, surpassing titanium in its resistance to scratching and wear. Both metals are highly favorable in their respective applications; titanium is preferred for aerospace, medical implants, and automotive industries for its lightweight and strength, whereas tungsten is favored in applications requiring high density and hardness, such as in military, electrical, and mining industries.
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