Archive for April, 2011


I follow the 4 Hour Body (4HB) diet and exercise program (and blog about it).  As part of that program, they suggest you use thermogenics (cold therapy) to accelerate weight loss.

The tactics involved include:

  • taking cold showers/baths
  • drinking cold water upon waking
  • using cold packs on your upper back for 20 minutes each evening
  • swimming in cold water

There’s a reason I don’t live in a cold climate – I hate being cold.  Simple as that.

I’ll drink the ice water in the morning and, after a run, I’ll talk a cool (not cold) shower, but I’ve never been able to convince myself to try the ice pack therapy.  This weekend, I changed my mind and decided to give it a go.

We have a cold pack which is about 6″ x 4″ and I tried that the first night, leaving it behind my upper back for about 20-30 minutes. (I lost track of time.)

But I wanted something bigger so I looked up recipes for homemade cold packs and found that the most common formulas are:

  • 2:1 – water to rubbing alcohol
  • 3:1 – water to rubbing alcohol

I used the 2:1 ratio and made three cups of the mixture, partially filling a gallon-sized Ziploc™ freezer bag.

Seeing an opportunity here, I started a lab book for my 4 and 6 year-old daughters and we recorded the “experiment.”

We talked about how different things freeze at different temperatures and thought about what might happen when you combine water with alcohol.  Would the mixture freeze at the same temperature, a lower one, or a higher one?

We recorded our method, our hypothesis, and our expected results.  (The younger daughter guessed correctly that it would not completely freeze at the same temperature that makes ice while my older daughter guessed that it would freeze at the same temperature.)

Tonight, we’ll take out the bag and examine it, recording the data we observe.  I’ll post the results here after we check it out.

(It’s fun to be able to combine these two aspects of my life. =)


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