# Lesson Units conversion examples

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## Units conversion examples

### Problem 1. Acceleration

Gravity acceleration at the Earth surface is 9.81 .
How much is this in ? In ?
Solution
1 ft = 0.3048 m (see, for example, the units converter under this topic, or any appropriate handbook, textbook, or the Internet web-site).
So, 1 m = 1/0.3048 ft = 3.2808 ft = 12*3.2808 in = 39.37 in.
Therefore, 9.81 = 9.81 * 3.2808 = 32.19 .
Further, because 1 ft = 12 in, we have
9.81 = 32.19 = 32.19 *12 = 386.2 .
Answer. Gravity acceleration at the Earth surface is 9.81 , or 32.19 , or 386.2 .

### Problem 2. Speed

Car A makes 100 miles per hour, car B makes 120 kilometers per hour.
Which car is moving with larger speed?

Solution
To compare speed of these two cars, let's convert the speed of car A to .
1 mile = 1609 m = 1.609 km (see, for example, the unit converter under this topic).
So, the car's A speed is 100 = 100*1.609 = 160.9 .

Answer. Car A is moving faster than car B.

### Problem 3. Flow

The water supply well produces 18 gallons of water per minute from the subsurface aquifer.
How much is the flow rate in cubic meters per hour?

Solution
1 gallon(US Liquid) is equal to 0.003785 (or 3.785 liters).
Hence, 18 gallons/min = 18*0.003785 = 18*0.003785*60 = 4.0878 .
Answer. The flow rate is 4.0878 .

### Problem 4. Temperature

The Death Valley in the Eastern California is the hottest place in the Western hemisphere with the highest measured temperature record of 134 °F (degree of Fahrenheit).
The world record is 57.8 °C (degree of Celsius) in Al 'Aziziyah, Libya.
Compare these two temperature records.

Solution
To compare these two temperature records, let's express 134 °F in Celsius using the conversion formula from Fahrenheit to Celsius
.
Substituting °F to this formula, we have for temperature of Death Valley
°C.
So, the highest temperature in the Death Valley is 56.67 °C against 57.8 °C in Al 'Aziziyah, Libya.

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