Question

How do you convert $4.5gal$ to $L$ ? How about $mL$ ?

Answer 1

Volume is defined as the amount of space occupied by any object. It can be expressed in different units like litres and gallons. Where one gallon will be equal to $3.78541178$ litres. Thus, a gallon is used to express a quantity containing a high amount of volume. Based on the above value gallons will convert into litres.

Complete answer:
Given value of volume is $4.5gal$
Matter can be defined as anything that can occupy space and has mass. Matter was divided into three types based on the arrangement of atoms. They are solids, liquids and gases.
Both gallons and litres are the units used to express the volume. Where one gallon will be equal to $3.78541178$ litres.
To convert gallons into millilitres, first convert gallons into litres and then litres to millilitres.
Given value of volume is $4.5gal$
To convert gallons into litres, multiply the value of gallons with $3.78541178$
$4.5 \times 3.78541178 = 17L$
Thus, $4.5gal$ is equal to $17L$
We know that when volume is in small values, it can be measured in millilitres. Where one litre is equal to $1000$ millilitres.
To convert litres to millilitres, multiply the value of volume in litres with $1000ml$
$17 \times 1000 = 17000ml$
Thus, $17L$ is equal to $17000ml$
From the above calculations, $4.5gal$ is equal to $17000ml$.

Note:
In solids the atoms will be tightly bound and have negligible volume. Liquids have more volume compared to solids due to the loose arrangement of atoms. In gases the atoms will be far away from each other and occupy a high volume. Based on the state of substance the units of volume can be expressed like litres or millilitres.