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
To work this out, we need to work through a couple of very simple equations. Firstly, every kg of gas (propane or butane) stored within the cylinder produces 14kw of heat energy. So to work out how much heat energy is in the cylinder we multiply the cylinder size (kg) by 14.Thus, the energy stored within a 15kg Butane cylinder is: 15 x 14 = 210kw.We now have to take this figure and divide it by the heat setting of the appliance you are using. So, for example, a typical cabinet heater produces 4.2Kw/hour on its maximum setting.Therefore 210kw/4.2kwh = 50hours heat (on maximum setting).e now have to take this figure and divide it by the heat setting of the appliance you are using. So, for example, a typical cabinet heater produces 4.2Kw/hour on its maximum setting. Therefore 210kw/4.2kwh = 50hours heat (on maximum setting).