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 Other Service Phone Numbers: 1  In Espanol Language Phone Number: 1-800-473-7346. 2  Request New Card Phone Number: 1-800-964-8542. 3  Gold Card Events Phone Number: 1-800-448-8457. 4  Gold Card Dining Concierge Phone Number: 1-877-300-3463.