Question

How would you describe the typical density of a gas?

1 year ago

·

3 Replies

·

962 views

N

Nicolette Mraz


3 Replies

AAA Profile Picture
AAA Best Answer!

Verified Sherpa Tutor

Gases have very low density compared to liquids and solids. Let’s look at why.

Density is a measure of how packed the particles are in any given material/substance/thing . Density is defined as mass( mass is measure of how many particles there are) per unit volume(a unit volume means one unit of volume such as 1cm3, 1m3, 1 dm3, 1 mm3 etc). In a gas the particles are spread apart the most, compared to liquids and solids. Therefore, in a given unit of volume there will be lesser number of particles in a gas compared to the number particles in the same volume of liquid and solid. This makes the gases less dense. Let’s try to understand in the context of the density formula as well.

                                                                                                           

:0

The formular for working out the density of a substance:   8zVuAeibECi8RYgUVirMAiMVZgkRgrsEiMFVgkxgosEmMFFomxAovEWIFFYqzAIjFWYJEYK7BIjBVYJMYKLBJjBRaJsQKLxFiBRWKswCIxVmCRGCv8DykMN6V20pdrAAAAAElFTkSuQmCC

For example, if we consider taking 1cm3 of a gas, liquid and a solid, the mass (the top number) is lowest for the gas. This is because the particles are far apart in a gas. If the particles are spread apart a lot then there will fewer number of particles making the mass very low of the gas.  In this example we know that we are taking 1cm3 of each, so the bottom number remains the same. What changes is the top number for the three states. Smaller the top number, smaller the density value, which means less dense the gas is.  


This is why you can lift a big inflated beach ball very easily than a small brick, it's the same reason why a beach ball would float and the small brick would sink if you throw them both to the water.

AAAA

Interested in booking a 1-1 lesson with me?

Click here to view my profile and send me a message.
Dr C Profile Picture
Dr C Best Answer!

Verified Sherpa Tutor

Of all the common states of matter, gases have the lowest densities because their atoms or molecules are furthest apart from one another with typically no or hardly any interaction. Typically then you could expect a metre cubed of gas to weigh about 1 kilogram i.e the density is about 1kg/m^3.

A very experienced teacher with a natural empathy for students

Interested in booking a 1-1 lesson with me?

Click here to view my profile and send me a message.
Parth  Profile Picture
Parth Best Answer!

Verified Sherpa Tutor

Typically the density of gas is very low. There are very few particles per unit of volume because particles are randomly arrnaged and spaced out. Remeber density refers the number of particles per unit volume.

UCL Medical student with 3 years of tutoring experience

Interested in booking a 1-1 lesson with me?

Click here to view my profile and send me a message.

Got the answer? Help Nicolette out.

Back To Chemistry Back To Chemistry KS3 Back To Topic
Alert Icon

Need help with Chemistry?

We have thousands of qualified teachers who are able to provide top quality lessons online. Find your tutor and set up your free introduction today!

Find a Chemistry Tutor