Weight of Apple Juice Calculating Yield - Does 1000L of Apple Juice weigh 1050KG?

[Ben]

Hi all,

Was trying to calculate the yield of my homemade press, hoping it was close to that advised by Vigo etc.... However when calculating it saw two potential methods, wondered which is used

By Volume

1440KG of apples made 1000L of juice. So 1000/1440 = 69.4%

However, I thought am I calculating this correctly

Should it be by weight?

1000L of juice at 1.050 specific gravity = 1050KG?

So should it be 1440KG makes 1050KG of juice 1050/1440 = 73% yield  (a little closer :))

Also made me think if 1000L of juice weighs 1050KG, but 1000L of cider weights 1000KG - a hefty amount of weight to loose - I assume in Co2?

Thanks,

Ben

[Claude Jolicoeur]

Ben, in my opinion, yes yield should be calculated by weight as I think this is the most representative way to calculate the yield, but not everybody calculates it this way.

You are "almost" right when saying "1000L of juice at 1.050 specific gravity = 1050KG"
Because actually it depends on the temperature... let's say you have 1050 kg of juice at SG 1.050. At 20C, this juice would occupy about 1002L, at 15C it would occupy about 1001L and at 5C it would occupy 1000L. This is because of thermal expansion - at higher temperature, matter increases in volume.

And yes, there is about 50 grams of CO2 that is produced (and lost to the surroundings) per liter of juice during fermentation. So this is 50 kg of CO2 for 1000L of juice.
Now we need to calculate the effect of this on global warming and climatic changes...

Claude

[Ben Fairall]

Thanks Claude,

Very detailed :)

In answer to the global warming part it appears that a car is much more efficent at producing co2. Will have to drink all my cider onsite to make up for it... http://www.yousustain.com/footprint/howmuchco2?co2=50+kg

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