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High School Physics: Homework Help Resource22 chapters | 277 lessons

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Instructor:
*Artem Cheprasov*

In this lesson, you will learn how to convert from quarts to gallons using the U.S. customary system of measurements and the British Imperial system of measurements.

A quart and a gallon are both units of measurements for volume, just like gallons, cups, and teaspoons are. Both quarts and gallons are used by the British Imperial and U.S. customary system of measurements. While the names are the same, the conversions between them are not. So, if you ever want to convert between these various units, do so using these conversion factors:

1 U.S. quart = 0.25 U.S. gallons

1 Imperial quart = 0.30 U.S. gallons

1 U.S. quart = 0.208 Imperial gallons

1 Imperial quart = 0.25 Imperial gallons

We'll use U.S. quarts and gallons as our example. To convert from quarts to gallons you just have to remember that there are 4 quarts to a gallon. To help your remember this, think of 'quart'ers. How many 'quart'ers are in one dollar? 4! How many 'quart's are in 1 gallon? 4!

Remember this conversion factor:

4 quarts = 1 gallon

We'll say we are converting 16 quarts into gallons. All we have to do is take the number of quarts we have and divide by the number '4' to get our answer in gallons:

(16 quarts) / (4 quarts/gallon)

(16 quarts) / (4 quarts/gallon) = 4 gallons

How can we check that we got everything right? Well, we can back convert. If we want to go from gallons to quarts, all we have to do is take the number of gallons we have and multiply it by 4:

(4 gallons) x (4 quarts/gallon) = 16 quarts

Seems like we calculated everything correctly!

Let's do one more example to solidify everything we've learned.

Let's say that an old British recipe calls for 4 quarts of water. You live in the U.S. and all of your measurement containers are in U.S. quarts. How do we get from the British Imperial quarts to the U.S. liquid quarts so you know how many U.S. quarts of water to measure out?

First, let's convert the British Imperial quarts into Imperial gallons.

1 Imperial quart = 0.25 Imperial gallons

Thus:

(4 Imperial quarts) x (0.25 Imperial gallons/Imperial quart) = 1 Imperial gallon.

So, we have 1 Imperial gallon so far. We also know that 1 U.S. quart = 0.208 Imperial gallons.

Therefore:

(1 Imperial gallon) / (0.208 Imperial gallons/U.S. quart) = 4.8 U.S. quarts

We need 4.8 U.S. quarts of water for the recipe.

Can we double check our answer? A simple conversion factor should suffice:

1 Imperial quart = 1.2 U.S. quarts

(4 Imperial quarts) x (1.2 U.S. quarts/1 Imperial quart) = 4.8 U.S. quarts.

Our calculations were correct!

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High School Physics: Homework Help Resource22 chapters | 277 lessons

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