Definition of viscosity

viscositynoun

độ nhớt

/vɪˈskɒsəti//vɪˈskɑːsəti/

The word "viscosity" comes from the Latin word "viscosus," which means "sticky" or "tarry." In the 15th century, the term was used to describe the thickness or stickiness of liquids, such as honey or tar. Over time, the meaning of the word expanded to include the concept of a liquid's resistance to flow, or its ability to "cling" to the sides of a container. The modern scientific understanding of viscosity, as we know it today, dates back to the 18th century, when French physicist Jean Romaine attempted to quantify the concept. He developed a device called a viscosimeter, which measured the flow rate of a liquid through a narrow tube. The results showed that different liquids had varying levels of viscosity, with some flowing easily and others flowing very slowly. Today, viscosity is an important concept in many fields, including physics, chemistry, biology, and engineering, and is used to describe the properties of substances ranging from water to oil to blood.

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Example:
  • The honey had a high viscosity, making it difficult to pour out of the jar.

    Mật ong có độ nhớt cao, khiến việc đổ ra khỏi lọ trở nên khó khăn.

  • The paint had a thick, viscous consistency that made it easy to spread evenly.

    Sơn có độ đặc, nhớt giúp dễ dàng quét đều.

  • The syrup had a low viscosity, allowing it to flow easily through the dispenser.

    Xi-rô có độ nhớt thấp, cho phép nó chảy dễ dàng qua bình chứa.

  • The molasses had a very thick, almost gel-like viscosity that required stirring before using.

    Mật mía có độ nhớt rất đặc, gần giống như gel, cần phải khuấy trước khi sử dụng.

  • The motor oil had a smooth, viscous texture that coated the engine parts evenly.

    Dầu động cơ có kết cấu mịn, nhớt, phủ đều các bộ phận của động cơ.

  • The molten glass had a very low viscosity, allowing it to be stretched into thin, delicate sheets.

    Thủy tinh nóng chảy có độ nhớt rất thấp, cho phép kéo dài thành những tấm mỏng, mềm mại.

  • The glue had a high viscosity, which made it sticky and adhesive.

    Keo có độ nhớt cao nên rất dính và kết dính tốt.

  • The soup had a thin, watery viscosity that lacked the rich, thick texture that the chef was looking for.

    Món súp có độ sánh, loãng và thiếu độ sánh, sánh mà đầu bếp mong muốn.

  • The engine coolant had a light, watery viscosity that helped regulate the engine's temperature.

    Chất làm mát động cơ có độ nhớt nhẹ, giống như nước giúp điều chỉnh nhiệt độ của động cơ.

  • The primer had a thick, viscous consistency that helped it adhere to the surface, creating a smooth base for painting.

    Lớp sơn lót có độ đặc và nhớt giúp bám dính vào bề mặt, tạo thành lớp nền mịn để sơn.

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