What is 21 degrees celcius into Fahrenheit?

To convert 21°C to Fahrenheit, you can use the formula:

F=95×C+32

Substituting 21 for $C$:

F=95×21+32=37.8+32=69.8°F

So, 21°C is equal to 69.8°F.

Here’s a detailed breakdown of the conversion process from Celsius (°C) to Fahrenheit (°F):

Formula:

The formula to convert Celsius to Fahrenheit is:

F=(95×C)+32

Where:

• $F$ is the temperature in Fahrenheit
• $C$ is the temperature in Celsius

Step-by-step conversion of 21°C to Fahrenheit:

1. Start with the Celsius temperature:
   • C=21∘CC 
2. Multiply by 95 (or 1.8):

   95×21=1.8×21=37So, 95×21=37

3. Add 32 to the result:

   $$37.8+32=69.8$$

So, 21°C = 69.8°F.

Understanding the formula:

• The factor 95​ (or 1.8) scales the Celsius temperature to match the Fahrenheit scale, where each degree Celsius represents 1.8 degrees Fahrenheit.
• The constant 32 is added because 0°C (the freezing point of water) corresponds to 32°F on the Fahrenheit scale. So, to shift the origin of the Celsius scale to match the Fahrenheit scale, we add 32.

Example:

• Freezing point of water:
  • 0°C = 32°F
• Boiling point of water:
  • 100°C = 212°F

This formula allows you to easily convert any Celsius temperature to Fahrenheit.