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 10 Digit toll free customer service number : 1-800-528-5200. American Express Platinum Travel toll free customer service number : +1-800-801-6564, 1-800-525-3355. American Express Green Card toll free customer service number : 1-800-528-4800, 1-866-207-7970, 1-800-243-3888. American Express Back Card Australia toll free customer service number : 1300 363 614.