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
A Btu (British Thermal Unit) is the amount of energy required to raise the temperature of one pound of water one degree Fahrenheit. Table 1 shows the Btu value for various energies. To compare the values on a propane equivalent we first convert the values to a MMBtu (1 million Btuâs). You take the energyâs price and divide it by its MMBtuâs. Natural gas is priced on a MMBtu basis. We then multiply the amount of propane Btu content per MMBtu (.0915) to get the propane equivalent value.