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I urgently need the meaning of all the letters in high school physics and chemistry. Can anyone help me summarize it? Thank you.

Owner, this is really too much. You should ask what you don’t know and what you need to know. . . I just listed some for you.

Hope to adopt!

Physical quantity (unit) Formula notes Deformation of formula

Speed ??V (m/S) v= S: distance/t: time

Gravity G (N ) G=mg m: Mass g: 9.8N/kg or 10N/kg

Density ρ (kg/m3) ρ=m/V m: Mass V: Volume

Resultant force F combined (N) has the same direction: F combined = F1 + F2

Opposite direction: F combined = F1—F2 When the direction is opposite, F1>F2

The buoyancy force F floats

(N) F float = G object - G view G view: the gravity of the object in the liquid

Buoyancy F float

(N) F float = G object this formula Applicable only

Objects float or suspend

Buoyancy F float

(N) F float = G row = m row g = ρ liquid g V row G row: The gravity of the liquid displaced

m row: the mass of the liquid displaced

ρ liquid: the density of the liquid

V row: the volume of the liquid displaced

p>

(i.e. the volume immersed in the liquid)

The equilibrium condition of the lever F1L1= F2L2 F1: power L1: power arm

F2: resistance L2: resistance arm

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Fixed pulley F=G object

S=h F: The tension on the free end of the rope

G object: The gravity of the object

S : The distance the free end of the rope moves

h: The distance the object rises

Moving pulley F= (G object + G wheel)

S=2 h G Object: the gravity of the object

G wheel: the gravity of the moving pulley

Pulley set F= (G object + G wheel)

S=n h n: the force passing through the moving pulley rope Number of segments

Mechanical work W

(J) W=Fs F: force

s: distance moved in the direction of the force

Useful work W has

Total work W total W has = G object h

W total = Fs is applicable when the pulley block is placed vertically

Mechanical efficiency η= ×100%

Power P

(w) P=

W: work

t: time

Pressure p

(Pa) P=

F: Pressure

S: Forced area

Liquid pressure p

(Pa) P=ρgh ρ: density of liquid

h: depth (vertical distance from the liquid surface to the desired point

)

< p>Heat Q

(J) Q=cm△t c: Specific heat capacity of the substance m: Mass

△t: Change value of temperature

Fuel combustion releases

The amount of heat Q (J) Q=mq m: mass

q: calorific value

Commonly used physical formulas and important knowledge points

< p>1. Physical formula

Unit) Formula notes Variation of formula

Series circuit

Current I (A) I=I1=I2=... The current is the same everywhere

p>

Series circuit

Voltage U (V) U=U1+U2+... The series circuit plays the role of voltage divider

Series circuit

Series circuit

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Resistance R (Ω) R=R1+R2+……

Parallel circuit

Current I (A) I=I1+I2+…… The main circuit current is equal to each

Sum of branch currents (shunt)

Parallel circuit

Voltage U (V) U=U1=U2=……

Parallel circuit

Resistance R (Ω) = + +......

Ohm's law I=

Current and voltage in the circuit

Proportional and inversely proportional to resistance

Current definition formula I=

Q: Charge (Coulomb)

t: Time (S)

Electrical power W

(J) W=UIt=Pt U: Voltage I: Current

t: Time P: Electric power

Electrical power P=UI=I2R=U2/R U: voltage I: current

R: resistance

Electromagnetic wave speed and wave

The relationship between length and frequency C=λν C:

Physical quantity unit formula

Name symbol Name symbol

Mass m kilogram kg m=pv

< p>Temperature t degrees Celsius °C

Speed ??v meters/second m/s v=s/t

Density p kilogram/meter 3 kg/m3 p=m/v

Force (gravity) F Newton (cow) N G=mg

Pressure P Pascal (Pascal) Pa P=F/S

Work W Joule (Joule) J W= Fs

Power P watts (watts) w P=W/t

Current I amperes (amps) A I=U/R

Voltage U volts (volts ) V U=IR

Resistance R ohms (ohms) R=U/I

Electrical power W Joules (joules) J W=UIt

Electrical power P watts ( Watt) w P=W/t=UI

Heat Q Joule (joule) J Q=cm(t-t°)

Specific heat c joule/(kilogram °C) J/( kg°C)

The speed of light in vacuum is 3×108 meters/second

g 9.8 Newton/kg

The speed of sound in air at 15°C is 340 meters/second< /p>

Compilation of junior high school physics formulas

Mechanics part

1. Speed: V=S/t

2. Gravity: G=mg< /p>

3. Density: ρ=m/V

4. Pressure: p=F/S

5. Liquid pressure: p=ρgh

6. Buoyancy:

(1), Fbuoyancy=F'-F (pressure difference)

(2), Fbuoyancy=G-F (depending on gravity)

(3), F float = G (floating, suspended)

(4), Archimedes' principle: F float = G row = ρ liquid gV row

7. Lever balance conditions: F1 L1=F2 L2

8. Ideal slope: F/G=h/L

9. Ideal pulley: F=G/ n

10. Actual pulley: F=(G+G moving)/n (vertical direction)

11. Work: W=FS=Gh (lift the object high)

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12. Power: P=W/t=FV

13. The principle of work: W hand=W machine

14. Actual machinery: W total=W Yes + W extra

15. Mechanical efficiency: η=W Yes/W total

16. Pulley block efficiency:

(1), η=G/ nF (Vertical direction)

(2), η=G/(G+G motion) (Vertical direction does not include friction)

(3), η=f / nF (Horizontal direction )

Thermal part

1. Endothermic: Q absorb=Cm(t-t0)=CmΔt

2. Endothermic: Q release=Cm( t0-t)=CmΔt

3. Calorific value: q=Q/m

4. Efficiency of furnace and heat engine: η=Q effective utilization/Q fuel

5. Thermal balance equation: Q discharge = Q absorb

6. Thermodynamic temperature: T=t+273K

Electrical part

1. Current intensity: I =Q power/t

2. Resistance: R=ρL/S

3. Ohm’s law: I=U/R

4. Joule’s law:

(1), Q=I2Rt universal formula)

(2), Q=UIt=Pt=UQ power=U2t/R (pure resistance formula)

5. Series circuit:

(1), I=I1=I2

(2), U=U1+U2

(3), R =R1+R2

(4), U1/U2=R1/R2 (pressure dividing formula)<

/p>

(5), P1/P2=R1/R2

6. Parallel circuit:

(1), I=I1+I2

(2), U=U1=U2

(3), 1/R=1/R1+1/R2 [ R=R1R2/(R1+R2)]

(4), I1 /I2=R2/R1 (shunt formula)

(5), P1/P2=R2/R1

7 fixed value resistor:

(1) , I1/I2=U1/U2

(2), P1/P2=I12/I22

(3), P1/P2=U12/U22

8 Electric power:

(1), W=UIt=Pt=UQ (universal formula)

(2), W=I2Rt=U2t/R (pure resistance formula) )

9 Electric power:

(1), P=W/t=UI (universal formula)

(2), P=I2R=U2 /R (pure resistance formula)

Commonly used physical quantities

1. Speed ??of light: C=3×108m/s (in vacuum)

2. Speed ??of sound: V =340m/s (15℃)

3. Human ear distinguishes echo: ≥0.1s

4. Gravity acceleration: g=9.8N/kg≈10N/kg< /p>

5. Standard atmospheric pressure value:

760 mm mercury column height = 1.01×105Pa

6. Density of water: ρ=1.0×103kg /m3

7. The freezing point of water: 0℃

8. The boiling point of water: 100℃

9. The specific heat capacity of water:

< p>C=4.2×103J/(kg?℃)

10. Element charge: e=1.6×10-19C

11. Voltage of one dry cell: 1. 5V

12. Voltage of one lead-acid battery: 2V

13. Safety voltage for human body: ≤36V (not higher than 36V)

14 , Power circuit voltage: 380V

15. Household circuit voltage: 220V

16. Unit conversion:

(1), 1m/s=3. 6km/h

(2), 1g/cm3 =103kg/m3

(3), 1kw?h=3.6×106J

Junior high school physics Formula compilation

Mechanics part

1. Speed: V=S/t

2. Gravity: G=mg

3. Density: ρ=m/V

4. Pressure: p=F/S

5. Liquid pressure: p=ρgh

6. Buoyancy: < /p>

(1), F float=F'-F (pressure difference)

(2), F float=G-F (depending on gravity)

( 3), F float = G (floating, suspended)

(4), Archimedes' principle: F float = G row = ρ liquid gV row

7. Lever balance Conditions: F1 L1=F2 L2

8. Ideal slope: F/G=h/L

9. Ideal pulley: F=G/n

10. Actual pulley: F=(G+G moving)/n (vertical direction)

11. Work: W=FS=Gh (lifting the object high)

12. Power : P=W/t=FV

13. Principle of work: W hand = W machine

14. Actual machinery: W total = W + W extra

< p>15. Mechanical efficiency: η=W / W total

16. Pulley block efficiency:

(1), η=G/nF (vertical direction)

(2), η=G/(G+G motion) (friction is not included in the vertical direction)

(3), η=f / nF (horizontal direction)

Thermal part

1. Endothermic: Q absorption=Cm(t-t0)=CmΔt

2. Heat release: Q release=Cm(t0-t)=CmΔt

p>

>3. Calorific value: q=Q/m

4. Efficiency of furnaces and heat engines: η=Q effective utilization/Q fuel

5. Heat balance equation: Q discharge=Q Suction

6. Thermodynamic temperature: T=t+273K

Electrical part

1. Current intensity: I=Q power/t

2. Resistance: R=ρL/S

3. Ohm’s law: I=U/R

4. Joule’s law:

(1), Q =I2Rt universal formula)

(2), Q=UIt=Pt=UQ power=U2t/R (pure resistance formula)

5. Series circuit:

(1), I=I1=I2

(2), U=U1+U2

(3), R=R1+R2

(4) , U1/U2=R1/R2 (voltage division formula)

(5), P1/P2=R1/R2

6. Parallel circuit:

(1), I=I1+I2

(2), U=U1=U2

(3), 1/R=1/R1+1/R2 [ R=R1R2/(R1+R2 )]

(4), I1/I2=R2/R1 (diversion formula)

(5), P1/P2=R2/R1

7 Fixed value resistor:

(1), I1/I2=U1/U2

(2), P1/P2=I12/I22

(3) , P1/P2=U12/U22

8 electrical power:

(1), W=UIt=Pt=UQ (universal formula)

( 2), W=I2Rt=U2t/R (pure resistance formula)

9 Electric power:

(1), P=W/t=UI (universal formula)

p>

(2), P=I2R=U2/R (pure resistance formula)

Commonly used physical quantities

1. Speed ??of light: C=3×108m/s (vacuum Medium)

2. Speed ??of sound: V=340m/s (15℃)

3. Human ear distinguishes echo: ≥0.1s

4. Gravity Acceleration: g=9.8N/kg≈10N/kg

5. Standard atmospheric pressure value:

760 mm mercury column height = 1.01×105Pa

6. Density of water: ρ=1.0×103kg/m3

7. Freezing point of water: 0℃

8. Boiling point of water: 100℃

9. Specific heat capacity of water:

C=4.2×103J/(kg?℃)

10. Element charge: e=1.6×10-19C

11. Voltage of one dry cell: 1.5V

12. Voltage of one lead-acid battery: 2V

13. Safety voltage for human body: ≤36V (Not higher than 36V)

14. Power circuit voltage: 380V

15. Household circuit voltage: 220V

16. Unit conversion:

(1), 1m/s=3.6km/h

(2), 1g/cm3=10^3kg/m^3

Element No. 01 : Hydrogen [chemical symbol] H, pronounced "light"

Element No. 02: Helium [chemical symbol] He, pronounced "Hai"

Element No. 03: Lithium [Chemistry Symbol] Li, pronounced "里"

Element No. 04: Beryllium [chemical symbol] Be, pronounced "Pi"

Element No. 05: Boron [chemical symbol] B, Pronounced "Peng"

Element No. 06: Carbon [chemical symbol] C, pronounced "Carbon"

Element No. 07: Nitrogen [chemical symbol] N, pronounced "Lan"

Element No. 08: Oxygen [chemical symbol] O, pronounced "Yang"

Element No. 09: Fluorine [chemical symbol] F, pronounced "F"

Element 10: Neon

[Chemical symbol] Ne, pronounced "Na"

Element No. 11: Sodium [Chemical symbol] Na, pronounced "Na"

Element No. 12: Magnesium [Chemical symbol] Mg, pronounced "美"

Element No. 13: Aluminum [chemical symbol] Al, pronounced "LV"

Element No. 14: Silicon [chemical symbol] Si, pronounced " Return"

Element No. 15: Phosphorus [chemical symbol] P, pronounced "o"

Element No. 16: Sulfur [chemical symbol] S, pronounced "flow"

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Element No. 17: Chlorine [chemical symbol] Cl, pronounced "green"

Element No. 18: Argon [chemical symbol] Ar, A, pronounced "sub"

Element No. 19: Potassium [chemical symbol] K, pronounced "A"

Element No. 20: Calcium [chemical symbol] Ca, pronounced "Beggar"

No. Element No. 21: Scandium [chemical symbol] Sc, pronounced "Kang"

Element No. 22: Titanium [chemical symbol] Ti, pronounced "Tai"

Element No. 23: Vanadium [chemical symbol] V, pronounced "every"

Element No. 24: Chromium [chemical symbol] Cr, pronounced "each"

Element No. 25: Manganese [chemical symbol ]Mn, pronounced "Meng"

Element No. 26: Iron [chemical symbol] Fe, pronounced "Iron"

Element No. 27: Cobalt [chemical symbol] Co, pronounced "Ancient"

Element No. 28: Nickel [chemical symbol] Ni, pronounced "謬"

Element No. 29: Copper [chemical symbol] Cu, pronounced "同"< /p>

Element No. 30: Zinc [chemical symbol] Zn, pronounced "Xin"

Element No. 31: Gallium [chemical symbol] Ga, pronounced "家"

< p>Element No. 32: Germanium [chemical symbol]Ge, pronounced "Zhe"

Element No. 33: Arsenic [chemical symbol] As, pronounced "Shen"

No. 34 Element No. 35: Selenium [chemical symbol] Se, pronounced "西"

Element No. 35: Bromine [chemical symbol] Br, pronounced "西"

Element No. 36: Krypton [Chemical symbol] Kr, pronounced "gram"

Element No. 37: Rubidium [Chemical symbol] Rb, pronounced "Ru"

Element No. 38: Strontium [Chemical symbol] Sr, pronounced "思"

Element No. 39: Yttrium [chemical symbol] Y, pronounced "B"

Element No. 40: Zirconium [chemical symbol] Zr, pronounced " "Notice"

Element No. 41: Niobium [chemical symbol] Nb, pronounced "Ni"

Element No. 42: Molybdenum [chemical symbol] Mo, pronounced "M"

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Element No. 43: Tc [chemical symbol] Tc, pronounced "got"

Element No. 44: Ruthenium [chemical symbol] Ru, pronounced "了"

Element No. 45: Rhodium [chemical symbol] Rh, pronounced "老"

Element No. 46: Palladium [chemical symbol] Pd, pronounced "Bar"

No. 47 Element: Silver [chemical symbol] Ag, pronounced "silver"

Element No. 48: Cadmium [chemical symbol] Cd, pronounced "spar"

Element No. 49: Indium [ Chemical symbol]In, pronounced "because"

Element No. 50: Tin [chemical symbol] Sn, pronounced "西"

Element No. 51: Antimony [chemical symbol] Sb , pronounced "ladder"

Element No. 52: Tellurium [chemical symbol] Te, pronounced "Emperor"

Element No. 53: Iodine [chemical symbol] I, pronounced "Dian" ”

Element No. 54: Xenon [chemical symbol] ><

p>Element No. 56: Barium [chemical symbol] Ba, pronounced "Bei"

Element No. 57: Lanthanum [chemical symbol] La, pronounced "Blue"

No. 58 Element No. 59: Cerium [chemical symbol] Ce, pronounced "city"

Element No. 59: Praseodymium [chemical symbol] Pr, pronounced "Pr"

Element No. 60: Neodymium [Chemical symbol] Nd, pronounced "female"

Element No. 61: Promethium [Chemical symbol] Pm, pronounced "Po"

Element No. 62: Samarium [Chemical symbol] Sm, pronounced as "shirt"

Element No. 63: Europium [chemical symbol] Eu, pronounced as "有"

Element No. 64: Gadolinium [chemical symbol] Gd, pronounced as " "Roll"

Element No. 65: Terbium [chemical symbol] Tb, pronounced "Intuit"

Element No. 66: Dysprosium [chemical symbol] Dy, pronounced "drop"

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Element No. 67: Holmium [chemical symbol] Ho, pronounced "fire"

Element No. 68: Erbium [chemical symbol] Er, pronounced "ear"

Element No. 69: Thulium [chemical symbol] Tm, pronounced "氪"

Element No. 70: Ytterbium [chemical symbol] Yb, pronounced "meaning"

Element No. 71 : Lutetium [chemical symbol] Lu, pronounced "鲁"

Element No. 72: Hafnium [chemical symbol] Hf, pronounced "Ha"

Element No. 73: Tantalum [Chemistry Symbol] Ta, pronounced "tan"

Element No. 74: Tungsten [chemical symbol] W, pronounced "U"

Element No. 75: Rhenium [chemical symbol] Re, Pronounced as "来"

Element No. 77: Iridium [chemical symbol] Ir, pronounced as "衣"

Element No. 78: Platinum [chemical symbol] Pt, pronounced as "波"

Element No. 79: Gold [chemical symbol] Au, pronounced "Jin"

Element No. 80: Mercury [chemical symbol] Hg, pronounced "Arch"

Element No. 81: Thallium [chemical symbol] Tl, pronounced "he"

Element No. 82: Lead [chemical symbol] Pb, pronounced "thousand"

No. Element No. 83: Bismuth [chemical symbol] Bi, pronounced "必"

Element No. 84: Polonium [chemical symbol] Po, pronounced "Pour"

Element No. 85: Astatine [chemical symbol] At, pronounced "Ai"

Element No. 86: Radon [chemical symbol] Rn, pronounced "Winter"

Element No. 87: Francium [chemical symbol ]Fr, pronounced "square"

Element No. 88: Radium [chemical symbol] Ra, pronounced "雷"

Element No. 89: Actinium [chemical symbol] Ac, pronounced "A"

Element No. 90: Thorium [chemical symbol] Th, pronounced "earth"

Element No. 91: Protactinium [chemical symbol] Pa, pronounced "Pu"< /p>

Element No. 92: Uranium [chemical symbol] U, pronounced "from"

Element No. 93: Neptunium [chemical symbol] Np, pronounced "take"

< p>Element No. 94: Plutonium [chemical symbol] Pu, pronounced "No"

Element No. 95: Americium [chemical symbol] Am, pronounced "Mei"

No. 96 Element No. 97: berkelium [chemical symbol] Cm, pronounced "bureau"

Element No. 97: berkelium [chemical symbol] Bk, pronounced "accompany"

Element No. 98: californium [Chemical symbol] Cf, pronounced "open"

Element No. 99: Einsteinium [Chemical symbol] Es, pronounced "Ai"

Element No. 100: Fermium [Chemical symbol] Fm, pronounced "Fei"

Element No. 101: Mendeum [chemical symbol] Md, pronounced "Gate"

Element No. 102: Noium [

Chemical symbol] No, pronounced "诺"

Element No. 103: Chromium [Chemical symbol] Lw, pronounced "Labor"

Element No. 104: 鐪[Chemical symbol] Rf , pronounced as "Lu"

Element No. 105: 钅钅[chemical symbol]Db, pronounced as "Du"

Element No. 106: 钅西[chemical symbol]Sg, read "Hi"

Element No. 107: 钅波[chemical symbol]Bh, pronounced "wave"

Element No. 108: 钅黑[chemical symbol]Hs, pronounced "黑" "

Element No. 109: Mt [chemical symbol] Mt, pronounced "马"

Element No. 110: Ds [chemical symbol] Ds, pronounced "Da"

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Element No. 111: uub [chemical symbol] Rg, , pronounced "Lun"

Element No. 112: uub (112)

Element No. 113 : uut(113)

Element No. 114: uuq(114)

Element No. 115: uup(115)

Element No. 116: uuh (116)