How to tell if a egg is bad? (Egg water test)
Channel: Kids Fun Science
Date: 2021-07-20

How to tell if a egg is bad?  (Egg water test)
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How many times have you cracked an egg into a bowl, only to question whether the egg has gone bad or not? Unfortunately, eggs are not the easiest to determine the freshness of as the shell hides the condition..
 
How to Tell If Eggs Are Bad
 
The fun method to conduct the egg floating test. This is not a myth; fresh eggs sink while bad eggs float to the top. 
 
Simply fill a bowl with cold tap water and place your eggs in it. If they sink to the bottom, they are fresh and good to eat.
 
A bad egg will float because of the large air cell that forms at its base. Any floating eggs should be thrown out. 

All egg cartons and trays sold in USA with a sell-by date. 
First: ignore the sell-by date. The USDA mandates that any sell-by date on eggs be 21–30 days from when they were packed. The sell-by date is very general, and while it's helpful for inventory management if you’re running a grocery store, it's not as useful for cooks at home.
 
There's a more reliable way to figure out whether your eggs are still good to eat. On the side of every egg carton, there's a longer numerical code listed above or below the expiration or sell-by date. The last three digits of this longer code correspond to the Julian date, which counts each day of the year as a number between 001 and 365—for example, "140" is May 20th (the USDA has a handy chart https://www.ams.usda.gov/sites/default/files/media/ShellEggDayoftheYearChart.pdf
, in case you don't want to do the math). 
 
That date is the exact day that the eggs were packed, and they're going to be totally fine within four to five weeks of that pack date.