Gases and gasses are both correctly spelled words, but they are the plural forms of different words.
Gases is the plural of gas, referring to substances in the gaseous state:
The atmosphere contains several different gases.
Gasses is the third person singular form of the verb gass, which is a relatively uncommon verb meaning to talk excessively, waste time talking or gas someone in certain contexts. It can also occur as the plural of the noun gass in specialized or informal usage.
For ordinary science and everyday discussions about substances, gases is the correct spelling.
Oxygen and nitrogen are gases. ✅
Oxygen and nitrogen are gasses. ❌
Quick Answer
- Gases ✅ = plural of gas
- Gasses ✅ = a form of the uncommon verb gass or related uses
- Gases is the word you want when talking about more than one gas.
Example:
Carbon dioxide and oxygen are gases.
Easy Rule
Gas → gases
The plural is formed by adding -es, not by doubling the s.
Why People Confuse Them
The confusion comes from the spelling of gas.
Some people assume that because gas ends in s, its plural should be formed by doubling the s:
gas → gasses ❌
But the standard plural is:
gas → gases ✅
This is similar to other words that form plurals with -es.
Gases
Gases is the plural of gas.
A gas is a substance that exists in a gaseous state.
Examples include:
- Oxygen
- Nitrogen
- Hydrogen
- Carbon dioxide
- Helium
- Methane
Examples
The atmosphere contains several gases.
Greenhouse gases contribute to climate change.
Different gases have different properties.
The laboratory stores several compressed gases.
Some gases are highly flammable.
Gasses
Gasses is not the standard plural of gas.
However, gasses can be correct when it comes from the verb gass.
For example:
He gasses on about his achievements.
Here, gasses is a verb form, not the plural of gas.
That usage is uncommon and many readers may find gasses unfamiliar.
Important distinction
If you’re talking about chemical substances:
gases ✅
If you’re using the verb gass:
gasses can be correct.
Gases vs Gasses Comparison Table
| Word | Correct? | Meaning | Example |
|---|---|---|---|
| gases | ✅ | Plural of gas | Several gases are present. |
| gasses | ✅ in limited usage | Form of the uncommon verb gass | He gasses on endlessly. |
| gasses as plural of gas | ❌ | Incorrect standard plural | ❌ Two gasses |
| gas | ✅ | One gaseous substance | Oxygen is a gas. |
When to Use “Gases”
Use gases whenever gas is being used as a noun and you mean more than one gas.
Science
The experiment involves several gases.
Chemistry
The reaction produces toxic gases.
Environment
Greenhouse gases affect the Earth’s climate.
Industry
The facility stores industrial gases.
Everyday Language
Strange gases were coming from the container.
Examples (10+)
- Oxygen and nitrogen are gases.
- The atmosphere contains many different gases.
- Greenhouse gases trap heat.
- Some gases are invisible.
- Certain gases can be dangerous.
- The reaction released several gases.
- The laboratory uses compressed gases.
- Scientists study the behavior of gases.
- Different gases have different densities.
- Some gases are highly flammable.
- The container holds several gases.
- Toxic gases can be harmful if inhaled.
Common Mistakes
Mistake 1: Using “gasses” as the plural of gas
❌ The atmosphere contains several gasses.
✅ The atmosphere contains several gases.
Mistake 2: Assuming every plural ending in “s” requires doubling
Not every word ending in s forms its plural by adding another s.
For gas, the standard plural is:
gas → gases
Mistake 3: Confusing “gases” with “gasses”
The difference is not simply an alternative spelling of the same plural.
gases = plural noun
gasses = usually a verb form of the uncommon verb gass
Gases vs Gas
Remember the singular and plural forms:
One gas
Two gases
Several gases
Examples:
Oxygen is a gas.
Oxygen and hydrogen are gases.
Why Is the Plural “Gases”?
The word gas takes -es in its standard plural form:
gas + es = gases
This also makes the pronunciation clearer.
Gas is pronounced with a short vowel sound.
Gases is commonly pronounced approximately:
GASS-iz
The plural therefore has two syllables.
Pronunciation
Gas
Usually pronounced:
/ɡæs/
Gases
Usually pronounced:
/ˈɡæsɪz/
So:
gas → one syllable
gases → two syllables
American vs British English
Gases is the standard plural of gas in both American and British English.
American English: gases ✅
British English: gases ✅
Gasses is not an alternative standard plural spelling of gas in either variety.
Similar Words
You may also want to compare:
- Gas vs gases
- Gas vs gaseous
- Gasoline vs gas
- Fumes vs gases
- Vapor vs gas
- Gassed vs gassed
Final Verdict
If you’re talking about more than one gas, the correct word is:
Gases ✅
Not:
Gasses ❌
For example:
Oxygen, nitrogen and carbon dioxide are gases.
Gasses can appear as a form of the uncommon verb gass, but this is a completely different use.
The simple rule:
gas → gases
FAQs
Is “gases” correct?
Yes. Gases is the standard plural of gas.
Is “gasses” correct?
It can be correct as a form of the uncommon verb gass, but it is not the standard plural of gas.
Is it “greenhouse gases” or “greenhouse gasses”?
The correct expression is:
greenhouse gases ✅
What is the plural of gas?
The standard plural is gases.
One gas, two gases.
Why isn’t the plural “gasses”?
Because gas forms its standard plural with -es:
gas → gases
Is “gasses” ever a real word?
Yes, but in a different grammatical use. For example, gasses can be the third-person singular form of the uncommon verb gass.
How do you remember “gases”?
Think:
One gas, two gases.
Or:
Gas + ES = gases.
Conclusion
The difference between gases and gasses is mainly a matter of meaning and grammar. When you’re referring to more than one gaseous substance, always use gases.
The atmosphere contains several gases. ✅
Gasses can occur in specialized or uncommon contexts as a verb form, but it should not be used as the ordinary plural of gas.
Remember This
Gas → gases ✅
Gasses → not the standard plural of gas ❌
Oxygen and hydrogen are gases.
Quick rule: When you mean more than one gas, spell it “gases.”
