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.
(it is the last 3 digits AFTER the credit card number in the signature area of the card). You can find your four-digit card verification number on the front of your American Express credit card above the credit card number on either the right or the left side of your credit card. CARD VERIFICATION VALUE CODE (CVV).