полимер

полимер

A polymer is a giant molecule made up of thousands of atoms. It can be natural or man-made (synthetic). Many plastics in everyday use are polymers, such as polythene or PVC; but then so is cellulose, which makes up wood pulp from which paper is manufactured.

0 0

完善词条

添加图像

词性：名词
同义词：
词汇：
行业/领域：自然环境
类别气候变化
Company: BBC
产品：
取首字母的缩写词：

添加至 My Glossary

其他语言：

类似词条

рафинирање на нафта

自然环境; 气候变化

Oil refining is the process of taking crude oil and turning it into fuels such as petrol and diesel. Crude oil varies in its composition, consisting of hydrocarbons and other ...

органско земјоделство

自然环境; 气候变化

There is no universally accepted definition of organic farming, and each country regulates what can and cannot be labelled "organic". In general, it describes a form of ...

озон

自然环境; 气候变化

Ozone is made up of three oxygen atoms. It has benefits and dangers depending on where in our atmosphere it occurs: near ground level, it is a pollutant that affects respiration; ...

емисии по глава на жител

自然环境; 气候变化

The total amount of greenhouse gas emitted by a country per unit of population.

пестицид

自然环境; 气候变化

A pesticide is a substance used to kill a pest, and in a farming context a pest is anything that attacks or competes with crops. Hence, there are many different types of ...

фотоволтаична клетка

自然环境; 气候变化

Photovoltaics are materials that produce electricity from sunlight. A single photovoltaic cell can be used to power small devices such as calculators; combined in solar panels ...