Jurnal FisTa Fisika dan Terapannya

Verifikasi Hukum Boyle dan Tekanan Hidrostatik Dengan Barometer Digital PS-3203

2026-05-16T22:35:45+00:00

This study investigates the relationship between gas pressure–volume behavior and liquid pressure–depth characteristics through experiments utilizing a PS-3203 pressure sensor. The objective is to quantitatively verify Boyle’s Law for gases and the hydrostatic pressure principle for liquids using digital pressure measurements. In the gas experiment, the air volume was adjusted using a syringe, and the pressure was recorded automatically. The results demonstrate an inverse proportionality between pressure and volume, confirming the equation . In the liquid experiment, pressure was observed to increase linearly with depth, with a gradient of 0,096 kPa/cm, corresponding to a water density of 979,6 kg/m³, indicating an approximate 2% deviation from the theoretical value. These findings validate both physical laws and demonstrate that the PS-3203 digital sensor can accurately verify Boyle’s Law and hydrostatic pressure while improving measurement precision and experimental efficiency.

Klasifikasi dan Estimasi Ketinggian Planetary Boundary Layer (PBL) Menggunakan Data Radiosonde

2026-05-16T22:35:52+00:00

The Planetary Boundary Layer (PBL) is the atmospheric layer closest to the Earth’s surface that plays a crucial role in weather dynamics. This study aims to classify the types and estimate the heights of the PBL in three regions of Indonesia representing different latitudes using radiosonde data during the period of January–December 2024. Classification was performed using the Potential Temperature Difference (PTD) method, while PBL height estimation utilized the potential temperature gradient, relative humidity, and parcel methods. The results show that at 00:00 UTC, the PBL is dominated by a stable boundary layer (SBL), whereas at 12:00 UTC, there is an increase in variability with the emergence of a neutral boundary layer (NBL) and a convective boundary layer (CBL). Estimates of PBL height ranged from <500 m to >2000 m, with the lowest values generally occurring in the morning and the highest during the JJA period. This study demonstrates that PBL variability in Indonesia is controlled by diurnal cycles, latitudinal differences, and atmospheric thermodynamic conditions, and contributes to the understanding of PBL characteristics in tropical maritime regions.

Karakterisasi Gugus Fungsi Arang Aktif Sabut Kelapa dengan Metode Pirolisis

2026-05-16T22:35:50+00:00

Activated charcoal can be produced from carbon-containing materials or from activated charcoal to get a wider surface area. Coconut coir is a part of coconut waste that is rarely forgiven. The researcher discussed the functional groups of activated charcoal from coconut coir with 10 ml of KOH activator. The purpose of this study was to determine the active charcoal content contained in coconut coir. The method used is the pyrolysis method in which combustion occurs in a furnace without oxygen at a temperature of 4000C. The analysis carried out by the researchers included a wave number spectrum analysis using the FTIR tool for coconut coir activated carbon. The identification results using the FTIR spectrophotometer showed that the activated charcoal in this study contained functional groups O-H, -O-, C-O, C=C, C-H

Analisis Kandungan Formalin Pada Mi Basah di Pasar Tondano dengan Spektrofotometri UV-Vis

2026-05-16T22:35:49+00:00

Food safety is a critical aspect in protecting the public from hazardous contamination. Wet noodles have a relatively short shelf life, making them susceptible to misuse through the addition of formaldehyde as a preservative. This study aimed to qualitatively identify the presence of formaldehyde and to provide a preliminary estimation of its concentration in wet noodles sold at Tondano Market. Qualitative analysis was conducted using potassium permanganate (KMnO₄), while quantitative analysis was performed indicatively using UV–Vis spectrophotometry with chromotropic acid reagent at a wavelength of 520 nm. The results indicated that all samples were positive for formaldehyde. The detected concentrations were 54.01 mg/kg, 35.82 mg/kg, and 26.43 mg/kg, respectively. The presence of formaldehyde in all samples indicates a violation of food safety regulations and poses potential health risks to consumers. These findings highlight the need for stricter monitoring of wet noodle distribution in traditional markets.

Studi Eksperimental Pengaruh Grid Turbulensi dan Fairing terhadap Karakteristik Aliran Terowongan Angin Menggunakan Tabung Pitot

2026-05-20T07:37:26+00:00

The investigation of airflow characteristics in wind tunnels is essential for various engineering applications, particularly in the aerospace field. This study aims to evaluate velocity distribution, boundary layer development, and the influence of turbulence using a Pitot tube as a simple and reliable instrument. The experimental method was conducted in a closed-circuit wind tunnel with measurements taken at several positions along the flow direction under conditions with and without a turbulence grid. The results show that the airflow velocity is not constant and tends to increase downstream due to boundary layer development. The presence of a turbulence grid increases the boundary layer thickness by approximately 2.5 times and induces velocity fluctuations, particularly near the inlet region. The installation of a fairing is shown to significantly reduce velocity deviation, from approximately 1 m/s to 0.5 m/s, thereby improving flow uniformity. It is concluded that the Pitot tube can be used to characterise the airflow. These findings imply that turbulence control and geometric modification of the wind tunnel are necessary to improve flow quality and the accuracy of aerodynamic measurements.

Karakterisasi Struktur Karbon Aktif Sabut Kelapa Sebagai Material Elektroda Superkapasitor

2026-05-16T22:35:43+00:00

In today's modern life, electrical energy has become a primary need that cannot be avoided. Supercapacitors are a new breakthrough in the field of energy storage, where supercapacitors have a higher power density than batteries and have a higher energy density compared to conventional capacitors. This study characterized the structure of coconut fiber activated carbon activated with NaOH with varying concentrations of 3 M and 5 M. Testing on X-ray Diffraction (XRD) showed the absence of sharp peaks which confirms that this activated carbon is amorphous, meaning carbon that is not arranged in a perfect crystal. Meanwhile, the FTIR test of 3M Coconut Fiber Activated Carbon confirmed many oxygen groups (C-O 1044 cm^-1 1044 cm^-1, strong aromatic peak (1567 cm⁻¹), more polar surface, and higher concentration of 5M deoxygenation (C–O weakens/disappears), more graphitized aromatic structure, higher porosity (CO₂ adsorbed ↑), more nonpolar surface. Meanwhile, coconut fiber charcoal (without activation) confirmed the main chemical components of coconut fiber, especially dominant cellulose, lignin and hemicellulose.

Analisis Potensi Panas Bumi di Desa Sampiri Kabupaten Minahasa Utara Berdasarkan Data Manifestasi Permukaan

2026-05-16T23:09:01+00:00

Energy needs have been increasing over time along with the increase in population and energy needs. Indonesia is one of the countries in the world that has enormous geothermal resource potential. This is because geologically, Indonesia is located in the Ring of Fire area, so it has the potential to produce geothermal energy, especially in North Sulawesi. This study aims to assess the geothermal potential in Sampiri Village, North Minahasa Regency. This study was conducted by analyzing fluid characteristics and estimating the temperature of the geothermal reservoir using geochemical methods and geothermometer calculations. The analysis was carried out through testing fluid samples in the laboratory, then data processing was carried out using Na-K and silica geothermometers and plotting a Na-K-Mg ternary diagram. The results of the analysis showed that the fluid type in Sampiri Village is immature water, indicating that the hot water in the study area has not reached equilibrium or has reacted with other elements on its way to the surface, with temperature estimation using a silica quartz geothermometer producing an estimated temperature of 250.1℃ - 261.2℃ indicating that this temperature is included in the high-type reservoir.

Analisis Spasial dan Temporal Temperatur Permukaan Gunung Api Ruang Menggunakan Citra Satelit Landsat 8 Tirs

2026-07-12T06:29:22+00:00

Indonesia is the country with the most mountains. The number of volcanoes in Indonesia is around 500. Of these, 129 are active volcanoes. This study aims to map the distribution of temperature and determine the direction of surface heat flow of Ruang Volcano before an eruption. This research was conducted by temporally analyzing the temperature distribution in Ruang Volcano to predict the direction of geological structure openings in the area using remote sensing methods. The analysis was carried out temporally using thermal infrared band 10 image data to determine the direction of heat flow according to the resulting distribution map. The analysis results show that the surface temperature distribution map of Ruang Volcano before the eruptions in 2015, 2019, and 2024 shows a similar pattern. Based on the surface temperature distribution map of Ruang Volcano, the direction of flow before the eruption comes from the northeast.