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.
CVVs are three digits on Visa, MasterCard, and Discover branded credit cards and CVVâs are four digits on American Express branded credit cards. The card is embossed on either the front or the back of a credit card along with the account number. So, for this particular card, this is a Discover card, let me show you the CVV number. So if you can see right there at the very end of the series of digits on the back of the card youâll see the number 281.