Development of Hydrostatic Vesting Meter with Simple Equipment Ammara Ittipongse1,* 1Applied Physics Department, Faculty of Science and Technology, Suan Sunandha Rajabhat University, Bangkok 10300, Thailand Email: ammara.it@ssru.ac.th

OUTLINE Introduction Material and Method Results Discussion and Conclusion

INTRODUCTION cost Buoyancy force What is Hydrostatic Vesting? How to use it? Why I do this study? cost Buoyancy force

MATERIAL and MATHOD D(s)>D(w) D(s)<D(w) Scales on resolution 0.0001 g Sample holder Bar frame Metal platform Sieve Thermometer Sample : Rubbers D(s)>D(w) D(s)<D(w)

Develop and create Hydrostatic Vesting Meter Beaker Basement Bar frame Sieve steel

Samples for density testing Rubbers EPDM   natural urethane PVC (ethylene-propylene diene )

Experimental procedure The experimental procedure was done in room temperature = 22.9 oc , H2O = 23.0 oc, density of fluid at 23.0 oc = 0.9977538 g/cm3. The samples were dipped in alcohol for against air bubbles occurring from rubber. All parts of equipments were consisted to be the Hydrostatic Vesting meter and then placed it on the balances.

Each sample of 8 was weighed by turn in air {Wt Each sample of 8 was weighed by turn in air {Wt. (a)} and after that dipped it in ¾ water height of beaker and weighted {Wt.(fl)} Handy equipment Standardize equipment

RESULTS EPDM PVC Natural urethane

Table. 1 Standard deviation of rubber samples

DISSCUSSION Balance steady The samples’ density testing indicated that if there is more spongy rubber from the samples the accuracy will less. (natural rubber) Handy equipment demonstrated the standard deviation less than standardize equipment for testing urethane density. (urethane) air bubbles beaker size bar frame Balance steady difficulty diffusion sticky air bubbles Balance steady

CONCLUSION Beaker size 8.5 x 6.8 cm 2 pieces, 10 x 6.8 cm 2 pieces and 9.5 x 8.5 cm 1 pieces which bigger than beaker of standardize equipment. The bar frame of handy equipment used copper cable size 0.13 mm (which smaller than the standardized equipment) by reference ASTM (vol.3) E 12 which smaller than standardize equipment. In conclusion, the results showed that this invention has sufficient to be used that were the less of standard deviation and significantly difference at 0.01.

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