Since blood production requires iron, you should eat iron-rich foods for two weeks before your appointment. This will help you have strong blood for donation and help you better recuperate after your donation. Iron-rich foods include spinach, whole grains, fish, poultry, beans, organ meat, eggs, and beef.
To calculate the change in temperature, subtract the initial temperature from the final temperature. Example: 84.2 degree Fahrenheit - 41 degrees Fahrenheit = 43.2 degrees Fahrenheit. The temperature from morning to afternoon changed by 43.2 degrees Fahrenheit.
Temperature is a measure of the level of heat. Heat is an energy term (measure in calories or jouels or BTU or other) while temperature is measure in degrees (centigrade or Farenheit or other). Different materials have different heat capacities. It will take different amounts of heat to raise the temperature of different substances.