incubation experiments.14

19 Aug

It’s my first “field” yogurt incubation experience! I was excited to make yogurt from Jersey milk, the same kind of milk I learned to make yogurt with back on the farm in France. Matt pulled a half gallon of straight milk for me – not “skimmed” down to the 4.5% milkfat required in whole milk for American supermarket standards. Kilgus yogurt is drinkable – not my favorite texture of yogurt, but how could I use any other cultures and any other milk while on the farm? After some struggles with the stove, thanks to Cooper’s guidance, I got the milk on the flame and Camlin and I sat back to wait patiently.

Of course, I let the milk overflow.

Not to be discouraged, however, I let it cool down…slowly. After an hour, it was finally cool enough to inoculate. I put the pot of milk in the freezer for some of that time, but I have since learned from David that due to some strange property of air, even immersing the pot in room temperature water would cool the yogurt faster. I set up my tea light and ceramic plate in the cooler in the garage, and I headed to the fair.

The next morning, I helped milk the cows, got distracted with the goats, and left the yogurt on the heat too long. The texture turned out fine – drinkable, like the Kilgus cultures – but it’s a bit sour for my liking.

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3 Responses to “incubation experiments.14”

  1. David August 22, 2010 at 4:20 pm #

    It’s nothing strange: the heat capacity of water (4.1813 C) is much higher than air (1.0035 C)

    “Hydrogen-containing polar molecules like ethanol, ammonia, and water have powerful, intermolecular hydrogen bonds when in their liquid phase. These bonds provide another place where heat may be stored as potential energy of vibration, even at comparatively low temperatures. Hydrogen bonds account for the fact that liquid water stores nearly the theoretical limit of 3 R per mole of atoms, even at relatively low temperatures (i.e. near the freezing point of water).”

    From: http://en.wikipedia.org/wiki/Heat_capacity

  2. Sophie August 23, 2010 at 3:50 pm #

    Nice tent!

  3. dental hygienist August 30, 2010 at 11:50 am #

    this post is very usefull thx!

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