does gasoline evaporate completely

Does gasoline evaporate completely? Internal combustion engines like those seen in cars, planes, and power plants all run on gasoline. 

And while handling a refill, you might end up spilling some. Will it be combustible when you have it on your floor? 

You know that it evaporates quickly, but how long will the process take to complete? The thing is that gasoline is used because of its high calorific value. 

But, it became a desirable car fuel because it combines with the air almost instantly in a carburetor.

The question is, “can it evaporate from the car tank?” If it does, “exactly how fast does gasoline evaporate?”

Yes, gasoline does evaporate completely. However, it may take from 90 minutes to several hours depending on the amount of gasoline and the type of surface. 

Living in the World Running on Gasoline

cars using gas

Gasoline, often known as petrol, gas, and motor gasoline, is a refined form of petroleum. 

It has a major impact on every society and has had a wide-ranging effect on the world at large.

Gas is what keeps everything moving, and without it, everything would stop. Some tasks will be impossible to complete if we do not have access to gasoline. 

Not only this, several useful byproducts are created by distilling gasoline, which serves as the foundation for various industries.

It is because of this dependency on gasoline that many countries now have a far brighter economic future thanks to it. 

The Connection of Gasoline and Crude Oil

a crude oil connection

When extracted from the ground, crude oil is the natural, unrefined collection of Hydrocarbons in liquid form. 

But, when these hydrocarbons are refined within a specific range of carbon atoms, you get what they call gas, gasoline, or motor fuel.

In short, fuel gasoline is refined from crude oil, and there are many ways in which it is now put to good use: 

It Helps Lubricate the Engines

using lubrication for engine

Crude oil helps make lubricating oils. Automobile engines rely on lubricating oils to function smoothly. 

They aid in keeping it from overheating, rusting, and failing altogether. 

It Keeps Transportation Going

The ability to get from one place to another quickly and easily is crucial to our daily existence. 

And that is when gasoline plays a big role.

Gasoline is not a renewable energy source and is extremely useful in vehicles ranging from trucks and cars to school buses. 

It Plays a Role in Cooking

cooking using gas

Gasoline obtained from crude oil is extremely useful for heating and preparing food. 

It has numerous applications in various domestic and commercial settings. 

It Helps with Power Generation

Gasoline is the primary source of power for many businesses. For instance, you can make use of diesel generators to help produce energy and electricity.

The truth is that there are so many ways gasoline is helpful in our daily life. 

Interestingly, this seemingly harmless clear liquid can catch fire easily, and it has another important aspect, which is related to evaporation. 

power generator

Does Gasoline Evaporate Completely or Not?

Yes, gasoline can evaporate but it takes some time to evaporate completely.

Gasoline is a flammable liquid hydrocarbon mixture with carbon numbers between 4 and 12. 

Gasoline vapor has a larger density than the solid form because of its low vaporizing point.

The low ignition energy of gasoline allows its fumes to spread over large areas after being ignited. 

does gasoline evaporate

And that happens because it reacts with oxygen almost instantly.  It implies that gasoline does evaporate, and evaporates quite quickly too.

Fact: In normal gasoline combinations, you can find as many as 150 different hydrocarbons, including isopentane, pentane, and the BTEX compounds. 

The Time Gasoline Takes to Evaporate Completely

So, how fast does gasoline evaporate? Well, it depends on many factors!

If you spill some gasoline in the open air, the evaporation process begins instantly and works quite quickly too.

The surface type plays a big role here. But mostly, the time needed to complete the task could range from 90 minutes to a whole day.

Gasoline loses about 1.6 liters per minute through evaporation. 

Since gasoline vapor is less dense than air, it can easily catch fire if an external flame is nearby. 

The Surface Type Matters

The speed at which gasoline evaporates is affected by the surface it is on.

cement with spilled gas

If it is on concrete, it is likely to evaporate much faster. 

But, the process will work up slowly if you spill gasoline on a porous surface like wood.

Similarly, many fabrics are likely to hold onto gasoline for quite long mainly because they can absorb it. 

The Weather Plays a Role

The time it takes gas to evaporate depends on the temperature, humidity, and wind speed.

The evaporation rate will go up when temperatures are on the higher side. 

Similarly, open areas allow for a greater rate of gas evaporation than closed ones. 

The Extent of Gasoline Spills Matters

The amount of gas that was spilled has a direct correlation to how long it takes to evaporate.

If the quantity that has been spilled is low, it will evaporate quickly and you will also be able to clean up the mess fast.  

An Important Point to Consider
considerations for gas

In its pure state, gasoline has the potential to degrade immediately. 

Because of this degradation, evaporation can sometimes take up to three months.

The boiling and melting points are much lower in case of ethanol, which is obviously going to expedite the evaporation process.

Due to evaporation and reactivity with the oxygen in the air, pure gasoline loses its capacity to provide energy when burned.

Remember, both humidity and oxygen contribute to gasoline’s deterioration. 

Therefore, fuel storage is problematic. 

Gasoline Evaporating in the Sun

As mentioned, gasoline is a refined form of petroleum mainly utilized in internal combustion engines.

The melting and boiling points of the hydrocarbons are relatively low, so they can quickly become loose and evaporate.

gasoline exposed to sun

The evaporation process is triggered in the presence of heat, and that explains why gasoline evaporates quickly when exposed to the sun. 

How Long will Gasoline be Flammable Once Spilled?

You already know that gasoline is flammable, but it maintains this characteristic until it does not evaporate completely.

Although it depends on the amount of gas, it usually stays flammable for up to 15 minutes, which is the time it needs to evaporate fully.

In most cases, if you can smell it, the chances are it has not evaporated completely. And it means that it remains flammable. 

Keep in mind that a gas spill is extremely dangerous and should be addressed promptly. 

An Important Consideration

Even if a spill occurs indoors, it may contaminate other items such as clothing or concrete. 

Gasoline, and especially its vapors, can ignite if they come into contact with an open flame, so take extra caution around it.

Fact: Using electrical equipment in the presence of spilled gasoline can be dangerous, as fire could break out because of electric sparks. 

The Fire Risk of Dried-Up Gasoline

risk of fire

The spilled gasoline begins to evaporate almost instantly but will not completely disappear in a few minutes. 

The process can take a while, and sometimes, even when it has dried up from the surface, the vapors may still be around to cause a fire.

It is still possible to ignite dried-out gas, although doing so takes longer. In order to get it going, you require serious heat. 

This can be explained by the drop in pressure and the fewer molecules per unit volume of gas.

Remember that the fire risk is still pretty strong so long as you can smell gasoline. 

If you no longer detect any odor of gasoline, that means there is none left and it has evaporated completely.

Fact: Carefully consider the surface type because the spilled gasoline may deeply pierce textiles and wood and have not evaporated completely even if it loses its smell. 

Gasoline Evaporating in a Car

car gasoline

While many people think gasoline can evaporate from their car tank, it is not always that simple. 

The safety and integrity of your vehicle’s design play the biggest roles here.

Nevertheless, unless the temperature or humidity levels are really high, you will not notice fuel evaporation from your car’s tank. 

And it is highly unlikely under normal driving temperatures and in bright sunlight.

It is mainly because your vehicle’s engine and tanks are constructed so that the vapor moves to the combustion chamber and stays there.

Fact: You are more likely to notice gasoline evaporating from your car if you fail to secure the cap tightly enough. 


Does gasoline evaporate completely? Eventually, it does, but the time it takes to complete the process may vary greatly. 

Many factors are at play here, including the amount of gas you have spilled, the type of surface, and overall temperatures. 

Similarly, in the case of ethanol, evaporation may be instant. But, it can take several hours if you have spilled it on wood. 

So long as you can smell it, there is always a fire risk, so you have to be careful.