physical change

简明释义

物理变化

英英释义

例句

1.The freezing of water into ice is a physical change 物理变化 that does not alter the chemical structure of H2O.

水冻结成冰是一个物理变化 物理变化，不会改变H2O的化学结构。

2.Boiling water results in a physical change 物理变化 as it transforms from liquid to gas without changing its chemical identity.

煮水会导致一个物理变化 物理变化，因为它从液态转变为气态，而化学性质没有变化。

3.Dissolving sugar in water is an example of a physical change 物理变化 since the sugar can be recovered by evaporation.

将糖溶解在水中是一个物理变化 物理变化的例子，因为糖可以通过蒸发恢复。

4.Cutting a piece of paper is a physical change 物理变化 because the paper's composition remains the same.

剪一张纸是一个物理变化 物理变化，因为纸的成分保持不变。

5.When ice melts into water, it undergoes a physical change 物理变化 that alters its state but not its chemical composition.

当冰融化成水时，它经历了一个物理变化 物理变化，这改变了它的状态，但没有改变其化学成分。

作文

Physical changes are an essential concept in the study of science, particularly in chemistry and physics. A physical change (物理变化) refers to a transformation that alters the form or appearance of a substance without changing its chemical composition. This means that the molecules remain intact, and no new substances are formed during the process. Understanding physical changes (物理变化) is crucial because they occur all around us in our everyday lives.One common example of a physical change (物理变化) is the melting of ice. When ice is heated, it melts into water. This process involves a change in state from solid to liquid, but the chemical structure of H2O remains the same. The molecules are simply moving faster and spreading apart as they gain energy from the heat. Similarly, when water freezes, it undergoes another physical change (物理变化) back to ice, demonstrating the reversibility of such changes.Another example is the process of dissolving sugar in water. When sugar is added to water, it dissolves and becomes part of the liquid. This is a physical change (物理变化) because the sugar molecules disperse throughout the water, but they do not change chemically. If we were to evaporate the water, the sugar would be left behind, indicating that no new substance was created during the dissolution process.In addition to these examples, physical changes (物理变化) can also involve changes in shape or size. For instance, when we cut a piece of paper, we are performing a physical change (物理变化). The paper is still paper, regardless of its size. Similarly, when we crush a can, the material remains aluminum, but its form has changed. These alterations do not affect the chemical properties of the substance involved.Understanding physical changes (物理变化) is important not only in scientific contexts but also in practical applications. For instance, in cooking, many processes involve physical changes (物理变化). When we boil pasta, it absorbs water and swells, changing its texture and shape. However, the chemical structure of the pasta remains unchanged, making it a clear example of a physical change (物理变化).Moreover, recognizing physical changes (物理变化) helps us understand how materials can be manipulated for various purposes. In manufacturing, knowing how to alter the physical state of materials can lead to innovations in product design and functionality. For example, glassblowers use heat to change the shape of glass, allowing them to create intricate designs while keeping the chemical properties of the glass intact.In conclusion, physical changes (物理变化) play a significant role in both natural and artificial processes. They are characterized by alterations in form, state, or appearance without any change in chemical composition. By studying physical changes (物理变化), we can better appreciate the world around us and apply this knowledge in various fields, from cooking to manufacturing. Recognizing these changes enhances our understanding of matter and its interactions, making it a fundamental aspect of science education.

物理变化是科学研究中的一个重要概念，尤其是在化学和物理学中。物理变化指的是一种转变，它改变了物质的形式或外观，但并不改变其化学组成。这意味着分子保持完整，在此过程中不会形成新物质。理解物理变化至关重要，因为它们在我们日常生活中无处不在。一个常见的物理变化例子是冰的融化。当冰被加热时，它会融化成水。这个过程涉及从固态到液态的状态变化，但H2O的化学结构保持不变。随着热量的增加，分子只是移动得更快并且彼此间隔开。类似地，当水冻结时，它又经历了一次物理变化回到冰，展示了这种变化的可逆性。另一个例子是将糖溶解在水中的过程。当糖加入水中时，它会溶解并成为液体的一部分。这是一次物理变化，因为糖分子在水中分散，但它们没有发生化学变化。如果我们蒸发水，就会留下糖，表明在溶解过程中没有形成新物质。除了这些例子，物理变化还可以涉及形状或大小的变化。例如，当我们剪一张纸时，我们正在进行一次物理变化。纸仍然是纸，无论其大小如何。类似地，当我们压扁一个罐子时，材料仍然是铝，但其形状已经改变。这些变化并不影响所涉及物质的化学性质。理解物理变化不仅在科学背景下重要，而且在实际应用中也很重要。例如，在烹饪中，许多过程涉及物理变化。当我们煮意大利面时，它吸收水分并膨胀，改变其质地和形状。然而，意大利面的化学结构保持不变，使其成为物理变化的明显例子。此外，认识到物理变化帮助我们理解材料如何被操控以实现各种目的。在制造业中，了解如何改变材料的物理状态可以导致产品设计和功能上的创新。例如，玻璃吹制工艺利用热量改变玻璃的形状，使他们能够创造复杂的设计，同时保持玻璃的化学性质不变。总之，物理变化在自然和人工过程中都发挥着重要作用。它们的特征是形式、状态或外观的变化，而没有任何化学组成的变化。通过研究物理变化，我们可以更好地欣赏周围的世界，并在各个领域应用这一知识，从烹饪到制造。识别这些变化增强了我们对物质及其相互作用的理解，使其成为科学教育的基本方面。