# the relationship of Physics project items unit and conversion

[Tensile strength]

【 tear strength 】

Commonly used units: Newtons (N,), kilograms (Kg), pounds (LBF, LBS) ten times Newtons (Dan)

Conversion relation:

1DaN = 10 N , DaN = deca Newton

1Kg =1000 g = 9.8 N = 2.2 Lbf(s)

[Joint Slip]

First, fixed load method

Common unit: millimeter (mm) or centimeter (cm)

Conversion relation: 1cm = 10mm

Two, fixed slip method

Commonly used units: Newtons (N,), kilograms (Kg), pounds (LBF, LBS) ten times Newtons (Dan)

Conversion relation:

1DaN = 10 N , DaN = deca Newton

1Kg =1000 g = 9.8 N = 2.2 Lbf(s)

[stripping strength]

Commonly used units: Newtons (N,), kilograms (Kg), pounds (LBF, LBS) ten times Newtons (Dan)

Conversion relation:

1DaN = 10 N , DaN = deca Newton

1Kg =1000 g = 9.8 N = 2.2 Lbf(s)

[bursting strength]

The breaking strength is divided into two ways:

Diaphragm breaking strength:

Commonly used units: kilopascals (kPa), millimeters of mercury (mmHg), millibars (mBar)

Conversion relation:

1 kPa = 7.5 mmHg =10 mBar

1 KPa = 1000 Pa

Pinball top breaking method:

Commonly used units: Newtons (N,), kilograms (Kg), pounds (LBF, LBS) ten times Newtons (Dan)

Conversion relation:

1DaN = 10 N , DaN = deca Newton

1Kg =1000 g = 9.8 N = 2.2 Lbf(s)

Single yarn strength

Commonly used units: gram (gf), Newton (N), centimeter Newton (cN)

Conversion relation:

1 gf = 0.01n = 0.1c [N

1 N = 10 cN

[wear resistance test]

Commonly used unit: revolutions

[Stretch Recovery]

Commonly used unit: %

【 crease recovery Angle 】

Common unit: Angle °

[Pilling]

Compared with the standard rating sample card, grade 5 is the best and grade 1 is the worst.

Commonly used unit: level

[Pilling-proof]

Count by the number of down roots run out.

Common unit: root

[Anti-hook Test]

Compared with the standard rating sample card, grade 5 is the best and grade 1 is the worst.

Commonly used unit: level

[Waterproof test]

Surface water repellency:

Compared with the standard sample card, grade 5 is the best, grade 1 is the worst, can be evaluated in the middle of the half grade.

ISO, GB, JIS methods: 1, 2, 3, 4, 5 levels

AATCC method: 50, 70, 80, 90, 100 points

[Hydrostatic pressure]

Commonly used units: kilopPa (kPa), centimeter water column (cmH2O), millimeter water column (mmH2O), millibar (mbar)

Conversion relation:

1 kPa = 10 cmH2O = 100 mmH2O = 10 mbar

[Rain Test]

The increase of the weight of blotting paper on the back of the sample was taken as the result.

Common unit: gram (g)

[oil rejection test]

Drop 1~8 oil on the surface of the sample, judge whether it passes according to the shape of the drop, and determine the grade according to the number of oil that can pass.

Commonly used unit: level

[Easy decontamination test]

First, the test oil is dropped into the sample surface, and a certain pressure is applied in the specified time. Then put the sample into the washing machine for washing and observe its oil removal. Compared with the standard rating sample, rating 5 is the best and rating 1 is the worst.

Commonly used unit: level

[Air permeability test]

The flow rate of the sample through the air per unit time, or the amount of the sample through the air per unit time or unit area, will be assessed.

Commonly used units: cubic centimeter/second/square centimeter (cm3 / s/cm2 or cm3 / cm2. S)

Cubic ft/min/square ft (ft3 / min/ft2)

Deduction unit: mm/ second (mm/s)

Conversion relation:

1 cm3 / s / cm2 = 10 mm/s

1 cm3 / s/cm2 = 1.967ft3 / min/ft2

[Water Absorption Test]

Water drop test:

Drop water droplets onto the surface of the sample until the specular effect of the water drops is removed. The time required to assess it.

Common unit: second (S)

【 core suction effect 】

Place a sample of a certain width vertically in water about 1.5cm, and see how much water climbs up along the sample in a specified time.

Common unit: cm/ time (cm/min)

[moisture permeability test]

Examine the moisture weight of the sample per unit area and per unit time for moisture absorption or evaporation.

Common unit: g/m2.24 hours (g/m2.24h)

Conversion relations: 1 g/m2.24h = 24 g/m2.24h, 1 g/m2.24h =1 g/m2.24h

[Thermal resistance RCT]

The samples were treated under stable temperature gradient conditions through a specified area of dry heat flow.

Common unit: square meter Kelvin/watt (M2.K /W)

[Wet Resistance RET]

Samples were treated under conditions of stable water vapor pressure gradient through a certain area of evaporative heat flow.

Common unit: square meter PASCAL/watt (m2.Pa/W)

[Thermal insulation rate]

When the temperature is 21℃ and the airflow is not more than 0.1M/S, the thermal insulation value of the clothing worn by the sitting person (whose metabolism is 58W/ m2) is 1 clo when he feels comfortable.

Common unit: Croat value (CLO)

Conversion relation: 1 CLO = 6.451RCT

[UV protection test]

The samples were radiated with monochromatic or polychromatic UV rays (band 290-415nm), and the total spectral transmission rays were collected to determine the total spectral transmission ratio, and the UV protection coefficient UPF of the samples was calculated. When UPF >50 and UVA < 5%, it can be expressed as BBB> or 50+

Common unit: UPF

When UPF >40 and UVA < 5%, it can be expressed as BBB> or 40+

When UPF >50 and UVA < 5%, it can be expressed as BBB> or 50+

[Anti-static test]

Half-life method:

In the specified time, high voltage current is connected to the sample, and the time (i.e., half-life) required from the moment of disconnection voltage to the time when the voltage decays to 1/2 is recorded.

Common unit: second (S)

Charge surface density method:

The sample surface is rubbed a certain number of times to measure the sample per unit area of the charge.

Common unit: uC/ m2

Voltage method:

Under a certain tension condition, the sample is rubbed against the standard cloth, and the charged condition of the sample is evaluated by the highest voltage generated within a specified time.

Commonly used unit: volt (V)

Resistance method:

Apply the specified DC voltage and measure the resistance between the two measuring electrodes on the surface of the sample. The smaller the resistance, the better the electrical conductivity of the sample!

Commonly used units: ohm (Ω)

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