In physics there are many different symbols to represent something. And the letter D also represents any such symbol in physics.

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**1. What is D in physics?**

D is the specific gravity.

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A term for a quantity that exhibits the property of mass density per unit volume of that matter. It is calculated as the quotient of the mass – m – of the object made of that substance (in its pure form) and the volume – V – of the object.

**2. Some other common and commonly used formulas:***h is height – stands for the word high (common unit is meter – denoted by m) *l is length – stands for length (common unit is meter – denoted by m)*s is the distance – stands for the word street (common unit is meter or kilometer – denoted by m or km) *v is speed – stands for the word velocity (common unit is meter/second or kilometer/hour – denoted m/s or km/h)*t is time – stands for the word time (common unit is hour (hour) or second (second) – denoted by h or s)*m is mass – stands for the word mass (common unit is kilogram or gram – denoted by kg or g) *p is pressure – stands for the word pressure (unit is Newton/square meter or Pascal (name of scientist) science), symbol Pa) * F is force – stands for the word Force (unit is Newton (scientist’s name), symbol is N) * t is temperature – stands for Temperature (unit is Celcius) or Kevil (scientist’s name), symbol is C or K) * P is power – an abbreviation of the word Power (unit is Watt (scientist’s name) – symbol sign W)

Symbols:pressure A:work done P:powerF:force exerted:distancev:velocity:timeS:area:heightl:lengthCalculation formula for heat Q = mc(t2-t1)volume :Vgravity quantity

mass:mDensity : D ; specific gravity: dQ: Heat (J) H: Efficiency Fc : frictional force Aci: Little work Atp: Total work: mass of object, calculated in kg.c: Specific heat (J/kg.K)= t2 – t1, is the increase in temperature of the object (degrees K or degrees Celsius). Heat balance equation: Q gain = Q to 1.c1.(t1 – t) = m2.c2.(t – t2) Calculate work: A = F.sA: Work (Nm)F: Lifting Force (N)s: Distance (m)Calculate Power:P = P: Power (J/s) –> Note: this P is P written flowers! A: Work (J)t: Time (s)Acsimeter Thrust:F = d.Vp=10mD=m/Vd=10DV=d.DCalculate EfficiencyH= (Aci/Atp).100%Atp=Aci+AmsPressure Fluid pressure is transmitted intact with a large piston of area S and exerts a force F on this piston: F=pS=fS all divided by s, => F/f=S/s

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