During fractional distillation, hydrocarbons are separated according to their......- Melting point.

分馏过程中烃类是以什么分离开的？- 熔点。

Stark and his colleagues found high concentrations of hydrocarbons — compounds found in fuels — and heavy metals, such as lead, copper and zinc.

斯塔克和他的同事发现了高浓度的烃类化合（燃料中的成分）和重金属，如铅、铜和锌。

And when those double and triple bonds appear, we've got whole new classes of hydrocarbons.

而当这些双键和三键出现时，我们就有了全新的烃类家族。

And this can be really important in fields like petroleum geology, because it can reveal whether sediments ever got hot enough for organic hydrocarbons to be converted into oil and gas.

这在石油地质学等领域非常重要，为它可以揭示沉积是否曾经达高的温度， 使有机烃类转化为石油和天然气。

Therefore, these simple hydrocarbons are pretty nonpolar and their electrons are distributed evenly over the molecule, which is why, you know, oil and water don't mix.

此，这些简单的烃类质是非极性的，它们的电子在整个分子中分布得很均匀，这就是为什么油和水不会混合的原。

For example, an increase in UV sunlight would increase the photolysis of methane gas, hence the production of hydrocarbons and associated hazes.

例如， 紫外线阳光的增加会加速甲烷气体的光解，从而产生烃类和相关的霾。

The process involves combining hydrogen with carbon to produce various hydrocarbon fuels, such as diesel, petrol or jet fuel.

该过程涉及将氢气与碳结合， 以生产各种烃类燃料，如柴油、汽油或航空煤油。

These researchers were working a nanotechnology-based catalyst to try and convert CO2 into a different hydrocarbon, like methane gas.

这些研究人员正在使用基于纳米技术的催化剂，试图将二氧化碳（CO2）转化为不同的烃类，比如甲烷气体。

Its high-pressure steam drove the engine pistons in virtual silence, in contrast to clattering gas engines which emitted the aroma of burned hydrocarbons.

其高压蒸汽几乎无声地驱动发动机活塞，与发出燃烧烃类气味的嘈杂汽油发动机形成鲜明对比。

And if you do that, you can actually increase the boiling point of other hydrocarbons dramatically.

而且如果你那样做，实际上可以大幅提高其他烃类的沸点。