An isotonic contraction can be concentric, which is where the muscle shortens as the fibres contract or eccentric, where the fibres contract as the muscle lengthens. When a muscle contracts with no resulting movement, it is an isometric contraction. Page: 1  1. 2  2. 3  3. 4  4. 5  5. 6  Back.
how much propane will i use i will be building an ig pool and ig spa 7ft spa i will be heating the spa with a 400k btu propane heater i would like to heat the pool a couple of time per year for special events local code limits the size of a propane tank to 125 gallons anything bigger will require a permit from the fire dept
25% capacity for 12 hours - 13.2 gallons/day or 92.4 gallons/week. 25% capacity for 18 hours - 19.8 gallons/day or 138.6 gallons/week. 25% capacity for 24 hours - 26.4 gallons/day or 184.8 gallons/week. Pool Heater Gas Usage-If you add the propane consumption of a pool heater, the numbers really start to climb.0% capacity for 2 hours - 2.4 gallons per day. 50% capacity for 6 hours - 7.2 gallons per day. If the pool heater (425,000BTU/hr) is used for one hour per day at 75% capacity, add 3.5 gallons per day to the numbers above (425,000BTU/hr Ã· 91,547 = 4.64 gal/hr â¢ 4.64 x .75 = 3.48 gallons).