compact
Definition
Compact can mean two things.
1. Dense or closely packed. A compact object is one that takes up a small amount of space for its mass. For example, a diamond is a very compact object because it is made up of carbon atoms that are tightly packed together.
2. A small, portable object. A compact object is one that is easy to carry around. For example, a compact disc (CD) is a compact object because it is small and lightweight.
In science, the word compact is often used to describe objects that are dense. For example, the nucleus of an atom is a very compact object because it is made up of protons and neutrons that are tightly packed together.
Here are some of the key things to know about compact:
- It can mean two things: dense or closely packed and a small, portable object.
- A compact object is one that takes up a small amount of space for its mass.
- A compact object is one that is easy to carry around.
- In science, the word compact is often used to describe objects that are dense.
How can the word be used?
The car was compact and easy to park.
Different forms of the word
Noun: compact (plural: compacts).
Adjective: compact.
Verb: to compact.
Adverb: compactly.
Etymology
The word "compact" comes from the Latin word "compactus", which means "joined together" or "made firm". It was first used in English in the 14th century to refer to something that is tightly packed or close together.
Question
When might you compact something?
AQA Science Exam Question and Answer
Question:
What are some examples of compact molecules?
Answer:
Compact molecules are molecules that are relatively small and have a high density. They are often found in liquids and solids. Some examples of compact molecules include:
Water: Water is a very compact molecule. It is made up of two hydrogen atoms and one oxygen atom, and the atoms are arranged in a very tight configuration. This gives water its high density and its ability to form strong hydrogen bonds.
Diamond: Diamond is a solid form of carbon. The carbon atoms in a diamond are arranged in a very compact lattice structure. This gives the diamond its high density and its hardness.
Graphene: Graphene is a single layer of carbon atoms arranged in a hexagonal lattice. Graphene is one of the strongest materials known to science. It is also very light and flexible.
Compact molecules are important in many areas of science and technology. For example, water is essential for life, and diamond is used in jewellery and in cutting tools. Graphene is a promising new material with many potential applications.
Additional information:
The compactness of a molecule is determined by the size of the atoms and the way that they are arranged. In general, molecules with small atoms and a high density of atoms will be more compact.
The compactness of a molecule can have a significant impact on its properties. For example, compact molecules are often liquids or solids at room temperature, while less compact molecules are often gases. Compact molecules are also often more dense and have higher melting and boiling points than less compact molecules.
The compactness of a molecule can also affect its interactions with other molecules. For example, compact molecules often form strong intermolecular forces, such as hydrogen bonds. This can give them unique properties, such as high surface tension or low vapour pressure.