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.
American Express RED Customer Service Number 0800 917 8012 Free Number. Call American Express customer service number 0800 917 8012 free number, which is the contact number for any enquiries about the American Express RED account. This type of card has no annual fee and is only available in the UK.