The heat for melting or freezing water, also called the Heat of Fusion (Hf), is 80 calories per gram at 0Â°C, which is the equilibrium temperature. In other words, it is necessary to add 80 calories of energy to melt one gram of ice at 0Â°C.
The CVV Number (Card Verification Value) on your credit card or debit card is a 3 digit number on VISAÂ®, MasterCardÂ® and DiscoverÂ® branded credit and debit cards. On your American ExpressÂ® branded credit or debit card it is a 4 digit numeric code.
Support & Contact: 1 800 American Express Phone Number Look Up What is the 1-800 number for Amex? Below is a list of toll free 800 numbers for American Express card holders. Customer Service: 1-800-528-4800. Please say or enter you 15 digit account number. You can also say report a lost or stolen card or apply for a new card account. Lost or Stolen Card: 1-800-327-1267