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.
For American Express, the four-digit CVV number is printed on the front of the card above the card account number. Visa / MasterCard / Discover American Express The verification number for Visa, MasterCard, and Discover cards are a 3-digit number printed on the back.It appears after and to the right of your card number. The American Express verification number is a 4-digit number printed on the front of your card.he verification number for Visa, MasterCard, and Discover cards are a 3-digit number printed on the back. It appears after and to the right of your card number. The American Express verification number is a 4-digit number printed on the front of your card.