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Z to Fahrenheit

Printed From: Dairy Science and Food Technology
Category: Site calculators and spreadsheet queries
Forum Name: Spreadsheet and site calculators
Forum Description: Support queries about calculators and spreadsheets downloaded from Dairy Science and Food Technology website or the ice cream mix subscription service
Printed Date: 25 Apr 2024 at 1:59am
Software Version: Web Wiz Forums 12.03 -

Topic: Z to Fahrenheit
Posted By: beachgirl
Subject: Z to Fahrenheit
Date Posted: 12 Oct 2011 at 8:31pm
Hi! Back again.
We need to turn pile of Brit Zs to US units. 10C is 50F! Something wrong

Posted By: formula123
Date Posted: 14 Oct 2011 at 9:00pm
Welcome back and thanks for posting in the forum.
You want to convert a z-value in Celsius to a z-value in Fahrenheit? I presume that you have converted say 10° C to 50° F? This is probably where you are going wrong. You cannot convert z-values in the normal way you convert from one temperature measurement system to another. In your case you need to convert a change in the number of Celsius degrees to Fahrenheit degrees by multiplying by 9/5. I have attached a screen shot of how to do this very simple calculation using a spreadsheet.
Z converter spreadsheet

Posted By: Guests
Date Posted: 30 Jun 2019 at 6:25am
Can you pls help to elaborate why multiple with 9/5 ?

Posted By: formula123
Date Posted: 30 Jun 2019 at 11:06am
Z-value can be defined in several ways e.g. the number of degrees Fahrenheit or Centigrade (Celsius) required for a thermal death time curve to traverse 1 log cycle. Note it is the number of degrees in the appropriate temperature scale that is required rather than the actual temperature. The 9/5 is an adaption of the normal equation for converting F to C.

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